Malicious PDF — malware analysis report

Static analysis result for SHA-256 2141ababe2818ad0…

MALICIOUS

PDF

99.0 KB Created: 2021-07-31 21:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3cf3b64a5ff4e284d2f5dd666b4a1a15 SHA-1: 5fa51d49ebb52042afd24fe0b4d741ac0646279a SHA-256: 2141ababe2818ad0fccde805744d9f868d32730e3025ebf4b0ee3dad97327457
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML score. It functions as a link farm, directing users to various URLs, some hosted on compromised CMS uploads and disposable domains. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://khabul.mn/mmpa/userfiles/files/68430510191.pdf In PDF document text
    • http://hwayinn.com/image/files/20210604_161125.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/mowaxikivin.pdfIn PDF document text
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/244d63fcs0rarb3fpndequ7aqk/50947577719.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/79064415384.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df0b1e8ae9---wasasodujexoka.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/baf14d9d03c84fdde3796836e131df8e/gamofegelomami.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/fajesorujubapa.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/putuxawowixafim.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902fa1c6b29---dixotigebezebubadedofe.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/aac4b8b775c101e15aa1132a515f386e/64471191369.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/55202174611.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/e95a28fb37d99785fc13286feebbf42a/69610209680.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/66789406438.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/65613404067.pdfIn PDF document text
    • http://www.hmh.sk/files/articles/file/piroxe.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160737e70bc7cc---86107202471.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d74080dc277---62300228619.pdfIn PDF document text
    • http://kleiberit.ru/files/file/lepibalokewumovovuko.pdfIn PDF document text
    • https://coatielectronica.com/files/46102944215.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/zisibitomi.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/852739977.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc2b1dd9e66---satubisawavovabolugiwupu.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/nadusomamewovalexag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=trabzon+n%C3%BCfus+k%C3%BCt%C3%BC%C4%9F%C3%BC+1834PDF 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_off00011c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000134ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AE 18552 bytes
SHA-256: f6cdab84bdca3e1c1191ffc8350aea97420d434ce774c836a9a3fe0efd0c8ddd
font_02_sfnt_off000161cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161CC 11228 bytes
SHA-256: 84295e46b07da7f03a8f554b2624fc1cc3a55d8238990e23d4a14f1908ae0d52