Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb4e9c31f50e38c…

MALICIOUS

PDF

88.3 KB Created: 2021-08-01 14:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6cc263a260cf67eb173bd7b84440aaed SHA-1: 75b5ebb05e1748a11ce03f8238c3d0ae3eae6988 SHA-256: 4cb4e9c31f50e38cb695e121d901772d3be66489054edc3ab5ce6bc05248d165
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or engage in SEO poisoning. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://guojingmall.com/userfiles/file///74719190825.pdf In PDF document text
    • https://allegypttours.net/userfiles/files/suzevenaz.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/89095649804.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160875c7b9e3e9---pupatifaxif.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/69b34b88456e10737cf498a0508ae428/tetif.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c282b1a490---kaxisabegat.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f6029bbbd---51884799260.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/97753504639.pdfIn PDF document text
    • http://jarosi.hu/files/file/wanazibuworozulujapun.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/75634ada730cac78582c97f83d9c05e2/didubuxukol.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/30gtq6mste3ff310v4o0bt7p84/veluvuboxerow.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c643ff841ad---dedewawewugajezitadag.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/kegirujedabigakobip.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d48a945b1c---vuvovajolefem.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/xomisefujogodudenodorole.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/aa69114bc378e9837ddf666579bf1701/wotugoreferubelev.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/162700553049749766731.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/80997644847.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/14511643654.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e9b4978db---15111646591.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/3203091925.pdfIn PDF document text
    • http://runo34.ru/attachments/file/97280061932.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/22402840997.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/529dc355449210130f16794967bafd13/31904225774.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/zeluzotuv.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/50444105587.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/gabasejirasokifagipipan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=la+fiesta+de+las+letras+3+santillana+pdf+completoPDF 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_off0000ee4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4A 10912 bytes
SHA-256: 71fa65cf12e55079053c24203d36c6fa73d8eeb467b912ca3344a7c4d5fa1840
font_01_sfnt_off00010785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10785 18980 bytes
SHA-256: 9448c0afd60ed0442a0d61cfc5473dfb734a2bdbcf22a335c951668292c777ad
font_02_sfnt_off00013805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13805 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1