Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e83036fd9f3bfc5…

MALICIOUS

PDF

76.4 KB Created: 2021-09-26 02:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: adea798d06779e588c324885ecdec8f1 SHA-1: fec8951f1118cf4c8fedd6635a6c5cd4c38e4d3f SHA-256: 7e83036fd9f3bfc58ba66f2cd28847c544df28400e9794788d10a2e8185b4693
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://godsownproperties.com/userfiles/file/jitalogujan.pdf In PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142629bea1a3---36932970300.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/50824019606.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/zekuwut.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/zexaxizipogijaxoweni.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/99214951481.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/3535b8cf09a17d32fab8a40194839aa9/jukenutigapaxobijana.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/97359517576.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/mexaxubifazup.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/vasanemagipozupu.pdfIn PDF document text
    • https://n-tlg.com/files/file/gejojewi.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/5826ad952eedc90417a3dbd050f06211/sefubanubaga.pdfIn PDF document text
    • http://mlight.cz/archiv/file/kikizokorajanerisuvojog.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/80338740360.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/28717433269.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021091005471573499.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/55c5bce640d822a75e2c64a058b7fe51/kedunefidizi.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/58117109770.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/12030476897.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/lorawomabevagi.pdfIn PDF document text
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/27914735529.pdfIn PDF document text
    • http://scpt.it/userfiles/files/zuvajarawukikabu.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148ecf787334---58299788360.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/c5086f8addc71bcca49c0535552a003a/lazuxon.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/51149257528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=sword+art+online+alicization+war+of+underworld+season+2+episode+22PDF 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_off0000b871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB871 21376 bytes
SHA-256: 04e8d8260e3dba850919047e9a2ebc1722523e008066c47cce445e05a5dc9a49
font_01_sfnt_off0000ef10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF10 11056 bytes
SHA-256: 0b005e21edfce02516a59c98ab9c86c99db7e5678bdde53825f40271df9b5370
font_02_sfnt_off0001090d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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