Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab73963ed4da7b00…

MALICIOUS

PDF

64.8 KB Created: 2021-06-11 23:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 438a9b67b5a9c0f0eceba9eb170ba99e SHA-1: 277cbddd2dc949118dd40f0a6a8c28cee1bbf23e SHA-256: ab73963ed4da7b003c9117faee35ab8c1fb3b56571eeee9979526ee5006e94eb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and link farms points towards an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8377

Heuristics 5

  • 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
  • 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=4+words+to+describe+someone PDF link annotation
    • http://wittlich-luexem.de/userfiles/file/genijirexinokesagowoze.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4aeb3bf91---35467631597.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/6cedc0b49fb242d84d519aac9acde4f9/12248448445.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9cacbf8f1---woxarovagipefinozasova.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940b9a0eed7---51561403188.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/moforososoxafu.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/274fcf5db07d8bbc4ebac031fd0289c2/rowol.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/d178cddf5b06cb9637fb87ef1c945d86/7188835290.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/tapad.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/88685382640.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/b07a33cd8f7819920a4d49537346370d/56884111447.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54a4d0e30b---lafatipibujilemobedof.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file/%5C/75174951163.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/9slvbl04menvirpeftjoak61lt/wivibuni.pdfIn PDF document text
    • https://artenika.pl/fck/file/38857867243.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED92 5068 bytes
SHA-256: a9e904195f4c752c4c2a41807405c1d0673703ebf36af7e82648b90cb0a15511

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