Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3869234bfca07b…

MALICIOUS

PDF

81.6 KB Created: 2021-04-29 09:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed645d34f8bf96bc14194fd18e9d9a54 SHA-1: 93a0b4f9b876520a3650a9a554c475aa06f5d7aa SHA-256: 9c3869234bfca07b9f934fb41436803fea5d4f16c926b0e99fa3fc8fa2272cfb
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm hosted on compromised WordPress sites, with numerous distinct hosts and URLs pointing to PDF files. While no scripts were extracted, the presence of embedded URLs and the link farm structure suggest an attempt to redirect users to malicious or phishing content.

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 http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/nlumlnrmgqnlgpsjls3ef1ttc2/merikubego.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607fda05755f4---26079986342.pdf
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/uo60edqmtrumi67sj04ltmfv3l/98449378871.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/81ebf2128b1f9ec86face48c1f35654c/xudesoporosakititipiji.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7870c27ff---35563658487.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/b7v4l0hi2ol4dnn32aj7264kd7/natuzuwupiwedojopani.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/f54d4a0b53b1ae30dd75f3716de9d702/27941196223.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e395055841---wagaj.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160708ce356cef---16213029910.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6005ca43f---85238749353.pdf
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/461b3ed4378b5962034dbc5efd60de0a/wugituvogixavefamu.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8ceb828c0---22936596404.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7b93947e4---givujuzefaruwimixamikor.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/vmfqc30p34ba5r0m9klmfeumss/zuwutatexajokexeja.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708868888a2---48569553093.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16083a9d372229---22198930667.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/nl4lrnf0thkfv46r4d9lqnsv47/worojejel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=set+text+style+bold+programmatically+android
    • 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://scripts.sil.org/OFL
    • 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_off0000e6c1.bin
b4cd067c7ffa5059d8abbc5c2058ef054594a2e073f13547c2bba586c373645c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C1 5808 bytes
font_01_sfnt_off0000fa71.bin
b88dd1ef9a35773f4beb457df8afcba678b3d11d7d8c3b9f5c078d4104c54e44
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA71 11448 bytes
font_02_sfnt_off000121b3.bin
4682b72f2afa33b20cf875d84024ffdd6778cb348d5560ed491e7fe37e149525
pdf-font-stream PDF embedded font (sfnt) at offset 0x121B3 16192 bytes