Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb7b9c0ca6517d49…

MALICIOUS

PDF

73.1 KB Created: 2021-06-20 22:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 59f2906c3a1b79ceb0178d2fc3c145f0 SHA-1: 0f737e1109770fb138f9e5f9bf58e392311bb860 SHA-256: eb7b9c0ca6517d49a94352a1f67feaf1088a36555ac55374674431f50990d4dd
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The primary goal appears to be directing users to external, potentially malicious websites, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings strongly indicate a malicious link-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fdf48e4ac---basegara.pdf In PDF document text
    • http://alexlunacoach.com/img/editor/file/mikisiwapenerofasujagax.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/eeb0d2b294a00858e4ab7db0e7451f05/98059808333.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/f0f4e38781b6f3d5c2cc772f2485683d/fafodolelazozati.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/0u7mo6jeih7g1ggot8eqa981kq/lulobo.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb5da1be0d---64696148393.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/56462459109.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/ib6mkdfakrs1d5ss3u6s7bgdp7/samifinol.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/92bcd8fcd8c0d5925f296ab13c286241/7542454919.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/6069496431.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/712228394608bd0d435b80.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/sanakebebaxolezifona.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/sizupoxonululam.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6456d49409---24116483873.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/h7r2mfsqrb7n1ef0nduuhn475h/49439736550.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/peremisutemaxoz.pdfIn PDF document text
    • http://protok.pro/upload/files/pukizovitofat.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/qg6p0drdgf17bf3886nksrfk92/wunulovap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=sims+mod+slice+of+lifePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22D 4964 bytes
SHA-256: b19f42986d5e850786893d3887adf873de7c4a913ca10bae7c48cbf8081747f4
font_01_sfnt_off0000f30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30A 10664 bytes
SHA-256: e7a66bc28387e4ddbd8cb343027608cc10cb14339252efe75a6c90bcbc91cf69