Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2426fc8062a3ec5…

MALICIOUS

PDF

85.4 KB Created: 2021-09-01 02:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9d1e98789d0ebca055bb79295132353d SHA-1: f663521ec58c78dfe10d6cee1d3917f5a423b362 SHA-256: b2426fc8062a3ec5cd433d7adc15607ff299c6f30cbb9950d0e7c1d8816f19e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable domains, likely for phishing or malware distribution. The presence of numerous unknown URLs supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://satisfytech.com/ck/upload/files/zifuxedaze.pdf In PDF document text
    • http://khamtribacninh.com/images/files/40418980295.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/nevudowanerekejas.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///86740462859.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/bubajujuwulekusofux.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c17627da7---madedezitedupojigivi.pdfIn PDF document text
    • https://venus-forever.com/image/files/28730077726.pdfIn PDF document text
    • https://mauspro.net/upload/files/gavovod.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/kologidefanibi.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa4e387f04---54334334248.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/73506342349.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/77130937629.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/57593467462.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/lenumewov.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/86565623660.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16082be0411c4e---mukasanewut.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16124d6854cc2f---16893481803.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/on2r7aof00okteag4330g28lho/narevorekekobekakenopu.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/11731069010.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db590d9b3a---lukupobexadutululanako.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/abe99t4nltq62e02c1hk610lk9/64795956001.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/bamomezerolilasuveg.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/nidefitupowif.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608325e8e27e6---9281386398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=appendix+after+bibliographyPDF 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_off0000e7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FD 10944 bytes
SHA-256: 4b217f63edd6027d5c969a908f36efb2d31c05e134c8543d4a3df45687ee09e9
font_01_sfnt_off000100dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DC 17832 bytes
SHA-256: 7a88001afdb5f0e01aae3998cdbce5a0b59189472fbfcd4dc9a73e5229fff9a1
font_02_sfnt_off00012f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1