Malicious PDF — malware analysis report

Static analysis result for SHA-256 a625d034f7f8dd4e…

MALICIOUS

PDF

84.6 KB Created: 2021-06-27 20:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c88d6c049eaedb8681d2147e3df677e2 SHA-1: a376011e1439aca4eb7bfbe5f7f62438572ecfb6 SHA-256: a625d034f7f8dd4edaa08f2c83da185a77f5e440f6bb3e1526e4a5aea6b9ee80
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 CMS upload storage, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa49bafe23---7089573014.pdf
    • http://wingmanresearch.com/userfiles/files/favawazaboxi.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608867dcb23a5---kimeluzebikawefozanix.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc55373559---72012827981.pdf
    • http://aven.su/userfiles/file/movekefenevizumudoluful.pdf
    • http://shuswapladystriders.ca/userfiles/file/96428349430.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca01a908bd6---29027784300.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/58280b75825b54f8fadd0a6282f1fe74/89990624341.pdf
    • https://strechybenesov.cz/content/65402361791.pdf
    • https://guapa2.com/admin/fck/file/65556551881.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/1cussk9gkks1scf7ee4oq2dn6q/gibevefawusuvolove.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076088142929---66695743671.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803d600affe---38066806722.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5127b88a06---80182428558.pdf
    • http://lyzebrno.cz/userfiles/file/konitofosimigigabugekeva.pdf
    • http://zabradli-znerezu.cz/userfiles/file/57158555980.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b52e6c1663---tivadofixomoxi.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/6030f3587e3961d8a4441194d74d4b63/sosifujaxaduk.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/0ae5d115d0ce91007c586bade00a8098/demezogipodabosedafod.pdf
    • http://modnyi-buket.ru/uploads/files/botebagabomeser.pdf
    • http://askort.pl/Upload/file/ritalu.pdf
    • https://actor-conseil.com/files/file/tavadetopajesonidubakesom.pdf
    • http://thegioituigiay.net/uploads/files/767684130.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4939ec5ddc---21046156067.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeadeb326e---47709606461.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096899cb7509---tijetuwopikamerinaso.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=correct+manual+handling+procedure+when+working+on+hydraulically+raised+equipment
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e72c.bin
b2ba4f8af36a93a192cc44c6db1fef935ab1d761e8e5de8e9121b5764058b9dd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE72C 11528 bytes
font_01_sfnt_off000101df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101DF 16792 bytes
font_02_sfnt_off000119f1.bin
312f596e6bd48937328aa2943fe969889c240f4086ee95e65a2afa6de365d2d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119F1 16344 bytes