Malicious PDF — malware analysis report

Static analysis result for SHA-256 07679590d5a79976…

MALICIOUS

PDF

86.6 KB Created: 2021-07-12 17:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8dffcb7884f98bc1e2fcbb4c6e42504c SHA-1: 4ed4d619d61ce30a00b9b1e9f0043723ff903220 SHA-256: 07679590d5a79976a9ea08cb5864484077458c566ccf6a521b426b13895200e2
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and links to compromised WordPress sites, suggesting it is designed to trick users into downloading further malicious content. The presence of a visual download button further supports a social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://bonfiremadigan.com/uploads/fckeditor/file/24327733326.pdf In PDF document text
    • https://yasacompany.com/upload/files/wujejumixiretewulime.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/igl1njahqfn66n3e869f9shqr6/27126855273.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/95682906710.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/97698224265.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/4b6763975ba3448f27a605e09d3398b1/39724933669.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/62099156571.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/qj2s65l4dek3dh8ltmo5vsmnaq/banidofadozoxo.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a333c3c574---18267533236.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e35d077d054---nitazagelaz.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/b89eb3d9e37431ad7a0b463e8f3c7f2d/16830442281.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/34145063219.pdfIn PDF document text
    • https://plasy.com/uploads/file/59602114774.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/41ef3e69d284a0f3a5acf2361c1588b6/solenexuzezusu.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/regusejunapixogekitako.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160affc68ee250---94104433554.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/41267695232.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/69441709419.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/27925254597.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/7abc87c9f6503b3a8745febafa15f72e/66107134530.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6dfde3de5---jadopepupipepegawar.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/69974936040.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/th3fm4e045jiaofj2esd8asi17/pebilumofovukowolizi.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a4723d3c50f---womutolufajurun.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/93992667473.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607159dd48e24---60990071567.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=subhash+kashyap+polity+book+pdf+in+english+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A7 18036 bytes
SHA-256: b1ea95d17fe0139852cc6bd5b13d8ff0b5756c8503a1674fe0b9ba6aee55b82f
font_01_sfnt_off000111a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A7 1780 bytes
SHA-256: ee6d8c25003eb2de61ee1fda640ec7b8e4605923364b71ee832b966c85f0f81c
font_02_sfnt_off00011a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0B 11284 bytes
SHA-256: a675c2cea9f33fdd832ce8053c5009cb642b90ef0250f882ce4476db744b3287
font_03_sfnt_off00013422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13422 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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