Malicious PDF — malware analysis report

Static analysis result for SHA-256 5751fbe9b528fb6a…

MALICIOUS

PDF

74.3 KB Created: 2021-06-26 04:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f870555c87894ba1180262f76952b5c6 SHA-1: 8cee809fa401d5a995cf90ae04c8b547c22a354e SHA-256: 5751fbe9b528fb6ac7365401e3c4809c012ea76c464c0b08a940f0c898232b7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for credentials. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://wastran.ru/uplcv?utm_term=big+mouth+super+mouth
    • http://rbtyutj01.com/userfiles/files/fobuxezosekesaru.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/3e8bbd505934955a60983ee261702055/gedofusobakuxufivexog.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/22879452750.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/31ce698ab763fa9707fcac8cf11a3022/nabogevenesu.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160871482e2a8c---5752748364.pdf
    • https://stillwaiting.org/userfiles/file/62463318196.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/0fec3e578fff9047fbc6ef17d5c7f7a2/37116338813.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/e17a2d084d3abe25875654aedba50fa9/33173441088.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/82241d4456eb99a2611dc3e1926b7af3/78489685188.pdf
    • http://komputerzagrosze.pl/userfiles/file/tuwiwi.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942f0958b29---kiparatefep.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/2a24jgqusep8hnl7bdb2cqq9qj/fuwotepi.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/of2dk8qctol045f22m1j7q2rc7/97332082985.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/e0f54c1d636b267e7bea54533836cbc3/xadewowu.pdf
    • https://amursvoidom.ru/media/files/46314335334.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/t6j4bd634qifso4hl791ls41nk/memutepagidupafetejoriso.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a794516f6---5091405375.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab6779a85a---52023274677.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b292fe15399---99648568250.pdf
    • http://world-spa-resorts.com/dok/kewerilese.pdf
    • http://mea-travel.pl/userfiles/file/21734108425.pdf
    • http://amandamaitland.com/images/file/63668567790.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_off0000bde8.bin
6b037174d5fd5ce23e45270e2c0b42173180efec511dc7f9eb26b79721cbed3d
pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE8 17524 bytes
font_01_sfnt_off0000ec07.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC07 16792 bytes
font_02_sfnt_off0001041e.bin
494b67d5d058037cbb1f0cc3dedacc9eb22d53928e2f6001f489a93db92b4b4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1041E 10540 bytes