Malicious PDF — malware analysis report

Static analysis result for SHA-256 02c1239f35543937…

MALICIOUS

PDF

74.6 KB Created: 2021-08-27 23:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87ed6e4422e5bbc69a94d19c8582484c SHA-1: c2a4c9c6a9f519ef69ce51516aed4bb028c27f92 SHA-256: 02c1239f355439371ddb1f09845ce1df5b1fb912d8f5119a7df25229af1ef8af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. The presence of 'utm_term' parameters suggests an attempt to track user interactions, common in phishing or spam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=short+vowel+a+words+with+pictures
    • http://vizit-k.net/uploads/editor/files/fewoviwev.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/a8c1255c0a96898e35d01e2119720853/lunivijilidixuxamubazi.pdf
    • http://naplesredeals.com/userfiles/files/13470987380.pdf
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/61969891287.pdf
    • https://jgranit.pl/userfiles/file/79022872866.pdf
    • http://yuhongzg.com/d/files/7757910006.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/09a5502e046774fec0500f36b4808f9c/86637682088.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16110d2d4b0cf9---zewafativ.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099862e1dc0f---logapurexerodiwatatemul.pdf
    • http://novafish.it/userfiles/files/15346632903.pdf
    • http://gibisch.com/files/files/45520447186.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f41feca63---vizepigomufejapaxijor.pdf
    • http://cintabogor.com/Uploads/userfiles/files/lurozi.pdf
    • https://serwisnawigacji.pl/userfiles/file/55261451464.pdf
    • http://wumag.pl/userfiles/file/finunabajonomoxapa.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/4b2cd99d837513b421a2ac86dd121dae/90341800832.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc30bb1139---tugidavo.pdf
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/1398526107.pdf
    • http://e-district.org/userfiles/file/pomek.pdf
    • https://alshamiltrading.com/alshamilfiles/file/najevasofelitusuzez.pdf
    • http://mesterek.net/tmp/69041230263.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969f9c55225---40910616339.pdf
    • http://oxigensupplies.com/shipinc/userfiles/files/63932052135.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/9p71femj2lh81i5ic33r0u2pum/vigatusurodejazaxul.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/kfsq2jfhdpmjdfl2m46b2kcupp/91364789837.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_off0000bfe0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE0 16792 bytes
font_01_sfnt_off0000d7f2.bin
70243b934e1550b316f3ae9b595773a2d7ea31556653fcb0e586c2dc63680dee
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F2 16872 bytes
font_02_sfnt_off0001036c.bin
de49f0ae165930dda743f6813f5cd7b2d9c62271da0ea7f26dd431f7b31e5484
pdf-font-stream PDF embedded font (sfnt) at offset 0x1036C 10836 bytes