Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b470c6e4d415fd…

MALICIOUS

PDF

82.5 KB Created: 2021-09-21 11:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 08994f72bd741aa9c3f9935b0be5c933 SHA-1: b958d4da1daf77872c1a6ea98afdc05eb727d9d1 SHA-256: c3b470c6e4d415fd59b0ab94d262fddd318976d360c212bb8ab151d0701698b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting it's designed to lure users to malicious content. The presence of a link farm heuristic further supports this, indicating a deliberate effort to distribute links across various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://madeirashopping.com/userfiles/file/tupuzoxuf.pdf In PDF document text
    • https://ocw.tw/uploads/files/83789867410.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/kekurelu.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/63807276292.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210920193629539100fespi.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/gubebujuperuzepogimoreg.pdfIn PDF document text
    • http://axwelindia.com/uploads/gagageveziwajisize.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/56625243144.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e88e4a7f7---95270248204.pdfIn PDF document text
    • http://futboltotal.net/images/files/46853226357.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161454c52edbb6---53384334042.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/lezoxapuna.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/54722679531.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614460254254d---waxazadolifusonep.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/12140225780.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/29357559137.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/zelevebojonafekezobasolum.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/95351908214.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/24735198538.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/sivuzexuxemujerefabak.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/tipexamalasagusanefeve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=crystal+anti+cheat+robloxPDF 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_off0000d853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD853 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06A 10712 bytes
SHA-256: f381800e4741219de07fd8825022364d299581a837fa7c39412591f340f2e374
font_02_sfnt_off00010901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10901 19480 bytes
SHA-256: 47e6ddcbf7a6af6bb59ddaa2fc7f03fecd8a2b6c0d7f94f2aa632cba3e2f0071