Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab7b535a2d7c58c4…

MALICIOUS

PDF

86.7 KB Created: 2021-07-01 12:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: cbf3dd3be1e7216fc1d47a24f9ca9371 SHA-1: 9a8fd40285620627b3fc2cb362fbb45a152a235c SHA-256: ab7b535a2d7c58c4200b0de41d9b93eb361a6ce644a8457a69a5e19915fa09e9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs and link farm structure are key indicators of this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • 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 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.
  • 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://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbbebb5112d---29915517863.pdf In PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/fhjfa5pg2g8vh08eeff9on1hci/79206708981.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/p5sm0spkmt8l4tq80mtpjvivnd/15424854751.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/bekugobab.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/1d537080012c2b34a436e49b459e4268/zumefu.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/lorukojerirep.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/90545468472.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/c7bdfb02b2edb26c129c0ef957c44a36/28143373184.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/65977002983.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//43600940066.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ee49d09b4da00ee97e5484bc4090f6e/90046392520.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609d355483cf6---jozuvejazeno.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/xaxupofaduguka.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160857032cb853---74906448344.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/80454600379.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/13214730980.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fba3501946---91787876928.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/44809871367.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/dcd5c9a259557890f28019200930d20e/wadal.pdfIn PDF document text
    • https://thietbidienmanhcuong.com/upload/files/53895700610.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/zeviwenu.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/8acca2021014eebd5c3120736ab038b9/29076195723.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/pabosizejivowejovur.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/nexesej.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/u5q19047q6kjici8iaiivfdu0c/basibifawisuka.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/33652530607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=40+divided+by+7PDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C0 17076 bytes
SHA-256: 33ecb2bc8a07f14bec5a52dae6349140b35f1fba775d2db960497fcc1a66bb10
font_01_sfnt_off00011f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F64 9916 bytes
SHA-256: 9a3aa29579a42f8344ce784ba38c86f7fa696ad1bae4d4d6ba5d355eb8f19b26
font_02_sfnt_off0001356f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1356F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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