Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b06c21ba50b6e2e…

MALICIOUS

PDF

86.7 KB Created: 2021-06-26 21:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d88c8740a8ee30977e06d7d5f0340395 SHA-1: f9fdfb834c5dbc6eb8f8079fac3b6177fc116300 SHA-256: 6b06c21ba50b6e2ea80be7d517f3720616fbdc31d348bc548300331590ff84ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/59c1c288f79efa9d7a19ef806a816811/kekudabobutew.pdf
    • https://bleikss.com/userfiles/file/muwomomaxo.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/a1e34cfbffceb6ca7854d67ed9f80e93/8085411901.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607334281effc---30792466958.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a24951c18ea---baganivajapopudepok.pdf
    • http://alliusie.com/userfiles/file/18496266829.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/f02d40b8ea0aaa9df1f9d9258642f93a/walosejirelelita.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/c2cbc0183e73afc52d6a0a6fe0990255/merew.pdf
    • http://churchtextile.com/userfiles/file/guzumadivib.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/82e5bba18580e3bcbeae22b089d2123e/10269842251.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b43cf7e8d5---81172380701.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/k5snssrqniem1iscb680702ii1/29054552290.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/lqjb049tiolgai7s093gcq1q6s/58778194784.pdf
    • https://gonguyenkhoi.vn/upload/files/nanemokoxeperapinenolawi.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/kom16qjpddsgoqs3ohfk3986hl/19539241496.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087745fa067c---46534530588.pdf
    • http://cornucopiafrederick.com/uploads/files/73767237180.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708f1773ea2---65725097864.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d94349f0c0---8851396483.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acdc5b339d---dimexudufatunoduzu.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36460bae5b---67967605781.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=i+know+i+know+i+know+for+sure+everybody+wanna+steal+my+girl
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d522.bin
305c6316bcf2c1c0dae50c7376d2598a5c0d3b22f25d82a4e5f79c2d6a238679		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD522 17164 bytes
font_01_sfnt_off000101bf.bin
327bcdefd1d58af5f949f889319b36148e7d975b20c6d6890a8e6e4a30074405		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101BF 17088 bytes
font_02_sfnt_off00011a57.bin
d1f431ba110db33a747620a77001238fbe607dd8332391db46312f8afd18ef6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A57 11248 bytes
font_03_sfnt_off0001349f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1349F 16792 bytes

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