Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f063974491f961…

MALICIOUS

PDF

71.3 KB Created: 2021-06-23 20:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 284447afbf8b938be8c33626c63ca19e SHA-1: f031b34cc353266045a454cd2a561dd18805a9ac SHA-256: 33f063974491f9619cd7718120a1bfd270e5f3c1de2f673bda1107cbfc829e29
154 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9863

Heuristics 5

  • 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
  • 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://studiofapas.it/userfiles/files/vuxagubo.pdf In PDF document text
    • https://ludifrance.fr/userfiles/file/22485415019.pdfIn PDF document text
    • https://unosms.us/userfiles/file/90283375316.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5101f0d68---lugigawakanuzi.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/13216358688.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/wasufinebegatedebonoritid.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/95218705007.pdfIn PDF document text
    • http://buildinggodskingdom.com/webcms/file/dozakelubugig.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/5559991552.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da7c3e8962---72185956880.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/r16p7o74dlqi8kfglalqd6rs04/lejibugezavodiw.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/330540eb2dc519ef8b8b2a04c4ba58d7/38784421976.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/51337380835.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/pikudubepo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=the+sims+4+full+editPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD16 4544 bytes
SHA-256: 6c2c1749336ea79a7b2e340a6a1914f85f416ced0510042051ab1a8044e40c5c
font_01_sfnt_off0000ec8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8A 10856 bytes
SHA-256: 0ab71a6dbe2be267a9597f5209f47a9b81badca7810832017bfd7a80be97335f
font_02_sfnt_off000111a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A2 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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