Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fc27334c3d7dcd9…

MALICIOUS

PDF

88.6 KB Created: 2021-07-07 23:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07f740e97632222b2ffb71d381086eb3 SHA-1: 703dd7eac73fbb12eb83f9346156599f7ab9fadd SHA-256: 1fc27334c3d7dcd99a690da4f9d31dc5bc9b63a3a8bc97dc27eec1f3e6db197a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to download password-protected archives, a common tactic to bypass gateway security. The embedded URLs suggest a multi-stage attack where the PDF serves as a lure to obtain a malicious archive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://catamma.ru/uplcv?utm_term=winrar+file+extractor
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/b49rko8it92q058c26mm5m0vc3/63764030024.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/9lpbbqrf530qmuk2imeqtvlp4i/96394226070.pdf
    • https://sjalikave.hu/pictures/file/bejuvufo.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/8017a44c63a9e18478237fb3d640b4e4/pokagubosu.pdf
    • https://planet-for-events.de/userfiles/file/49054732100.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd238e920ca---lukexotumilodod.pdf
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/f3621b877ddee90fe81f7b041b7d11cb/50273269988.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/5cde60653aec693a4f29d75b6cbb118c/42099328007.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6df1cbe9e---wivitelejoronirip.pdf
    • https://nonbodepsg.com/uploads/files/veganajobetenu.pdf
    • https://hamasataccessories.com/userfiles/files/kovaku.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff0c67a258---21282637088.pdf
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d00109966e---51539044116.pdf
    • http://w-f-l.de/user_img/file/wuxiserijikinopazebufuse.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077826e1d64e---19611640362.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/7eca2e7bd2e5491cdd008081a09913ae/wasaj.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/odtqgmh8o7qs79bmquq9k12nd8/wukakudevawamunurepavo.pdf
    • http://jullien38.com/ressource/site-image/files/46175281370.pdf
    • http://argol-editions.fr/userfiles/file/24477206512.pdf
    • http://beerskiboot.com/img/upload/file/3454257148.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4917c45d7---53925188598.pdf
    • http://vasvaripalmuzeum.hu/upload/file/nilijapexofew.pdf
    • http://pnmanagementsolutions.in/uploads/lurebosumot.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080d75c45438---48215017619.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_off0000f0a5.bin
4ff362a3b966c3897eedb7e4fcd1007815e02eb4de434ca1c4602718b56260ca
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A5 21580 bytes
font_01_sfnt_off000125fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x125FD 16792 bytes
font_02_sfnt_off00013e14.bin
73b5caf65f6802729533e24fc306071873f4bf8951f3309861a65ffd208e4b28
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E14 10256 bytes