Malicious PDF — malware analysis report

Static analysis result for SHA-256 b68581f19c761f26…

MALICIOUS

PDF

80.1 KB Created: 2021-09-13 10:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9a0e221929922f192d3cdd915096c73f SHA-1: 8c7c7f1dd0cb5f89fcf32a5d8980b5de5f531b3d SHA-256: b68581f19c761f265f4410fa9d70fc1bb9361464d851fc78aa43c1144cbb826e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary attack pattern involves luring users to external sites via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://alternativecarrepair.com/userfiles/file/nanenanalunabofilateporer.pdf In PDF document text
    • http://altadirezione-consulting.it/userfiles/files/5763488605.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/9254047227.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/gemuzizoxu.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/93165341451.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/199a20b51390423f7b9267b4d6e6e94d/maxadedopewad.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/60338744370.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/62609553962.pdfIn PDF document text
    • http://uhorder.com/upload/files/54054791408.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/90959922946.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd3e60a7a6---lulububesomomizalodik.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/vabuwisol.pdfIn PDF document text
    • http://jsdarvin.com/files/205747559.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/lewedexafetikep.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/84849385255.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/gekaledaluzikon.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/valanexusovomolojakokot.pdfIn PDF document text
    • https://vietnamwelder.vn/uploads/news_file/14760114497.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///36507368399.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/77027686967.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/c939a9a1ac2483b42754c0ee94c42f34/19561427719.pdfIn PDF document text
    • http://bulmarconsult.com/files/juwutavebovutesetinixevul.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109070558206508.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/51448384149.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/17993402321.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/c869d458a527a887831c5ed826d7ee68/bukale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+sync+music+from+windows+media+player+to+android+phonePDF 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_off0000d654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD654 11176 bytes
SHA-256: 8b21d8a9fcaa3752822b7d1991028cf2379ecd65f7cbd930951482a06ab40292
font_01_sfnt_off0000f045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF045 16176 bytes
SHA-256: 336b8808d8d7df97ec031c69a806f9dea2cd0cf408dff861756d3abb2913f89b
font_02_sfnt_off00011a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1