Malicious PDF — malware analysis report

Static analysis result for SHA-256 895b4c7834793290…

MALICIOUS

PDF

90.4 KB Created: 2021-06-27 03:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b05f54b429d41134403a9c5882700427 SHA-1: bffcc285aac8d93f1c4aef2d6acbbf51a2067d87 SHA-256: 895b4c7834793290b6006caed65858c4e6efb0ccb7135edfb161ff975eb1e0fb
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://aedwea.com/upload/foto/mepawogoxenema.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/t90g0pelmb5b07t6kl5mulocc9/rurotas.pdf
    • http://zkojicin.cz/userfiles/file/74288580167.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd844a0cc6---71474517274.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/082b56e96856008b693937fe40b289f4/92883454774.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/ccefae0182d405c03d7f44887c218229/jezedawukugupa.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d21c001a51---fevobekesawedefuborim.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/4bcdc11ff177c9d4399c651fe0ef49ba/79316654010.pdf
    • https://amitadevnani.com/userfiles/file/liriwojibutitemenixodox.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f45f78efc4---divewutawupesuzunovoxo.pdf
    • http://bularz-auto.pl/images/userfiles/file/nabowutisujamiruda.pdf
    • http://auburn-properties.com/userfiles/files/87672961404.pdf
    • http://octapus.vn/images/uploads/files/12391100597.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/6dc3dfb9aaf2c53ceae93a9a75e83f59/nafogulikadazekaleju.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160708763e4213---55030628526.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ccca121a95d---63762889394.pdf
    • https://rmp-familienanzeigen.de/cms/files/84321872809.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/i01m11nc7n5q5uliuhq8st31v1/53335177867.pdf
    • http://automsystem.com/UploadFile/file/20210510031636036.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160813611bae00---bafodekusikewofawakaralo.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608781d63e71e---94921566923.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/05uj5m0hgb53njvs8ldcis4uif/kofibuwux.pdf
    • http://alhouti.com/userfiles/file/16481457974.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=angular+6+form+submit+example
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770e37d8fa6---tazepimokomolo.pdf
    • 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_off0000ff72.bin
3c75b0e2d1777792b620cd0d6e96f0a99b06d1bb610842ee3d3323070d1c5f0f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF72 16412 bytes
font_01_sfnt_off00012a04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A04 16792 bytes
font_02_sfnt_off0001421b.bin
304c120fb71b49a8651eaea69f8817117d7236a6ea81ee062701f2f8b5c90d0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1421B 11192 bytes