Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f6487830a70b4c6…

MALICIOUS

PDF

83.9 KB Created: 2021-09-05 03:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4737aa422ac2a6e8e8d80f1e0b9a6c14 SHA-1: dfe47f212827f5bec5b6e1d7fbc2e89b41b59da0 SHA-256: 3f6487830a70b4c67296abc339c56fcc16e597d51f0320c2cd6cb01c39213e57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0b1a8b8d3---tezugusupuz.pdf In PDF document text
    • http://rent2day.ca/ci2/userfiles/files/lukitexegaluxujal.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/57577741226.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/52827028090.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-8/20210608014727383720.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9be3e89c57---56458302671.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/komidikevuxetoz.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/451df2f587717c2b506181f3ad4b3457/78207564994.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088a617d0552---154959193.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e93a80fe79---17496296393.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/54961570982.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/55636404147.pdfIn PDF document text
    • http://lphs-the60s.com/clients/5/5a/5a84a5cabe7f31a06b4bf99f7e1b7ad6/File/49511254039.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121d2aadcbe2---57638747624.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ad434797b726aed1908ad3bd87142b31/kitogepirixemefo.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a51af3cf39e---86621492401.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd85a38a851---74860543276.pdfIn PDF document text
    • https://tekartltd.com/upload/files/50386350130.pdfIn PDF document text
    • https://luminex.pl/upload/file/33753737671.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/kipimugoxejimegaxuj.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/56097994647.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/df59b120f8da744fa823e7e071437077/gogoxifitimepenurolazawex.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/40627097610.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/a61b6862e022ec8bf944fda7288e611c/13246715226.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/f01cdb6d72dee374c2022982c8ac07f2/baxuliza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=colageno+hidrolizado+liquido+pdfPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF590 20220 bytes
SHA-256: b5b8b8be0c6fa944461984efed769fdc60e98e9dc551a035aab0d5af7afd37cf
font_02_sfnt_off0001293a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293A 10848 bytes
SHA-256: 7dbda268216d0e43f706aaeadd29345d3e1c44ab837f89d98c13e486ef7d1d66