Malicious PDF — malware analysis report

Static analysis result for SHA-256 506571022a1562c1…

MALICIOUS

PDF

85.2 KB Created: 2021-06-29 12:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3160884fd288539faa81155ca75df30b SHA-1: 33bd3bddbad7f01c1e2cff90de9263289a90630b SHA-256: 506571022a1562c10caa98c0d2545c1ba23316a87f322c7bdbe0edf8bb0e5cc0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised websites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple links on disposable or compromised hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867e012742b---99901700552.pdf
    • http://goldway.jp/upload/board/file/mavegopakug.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/1784539a99bacab1a50cab503f5dcde1/92754887511.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090f15a1a6f5---xoxikajilemeru.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c55df8bce9---mabaxatubeju.pdf
    • https://burgas-remonti.com/userfiles/file/kipiwiviseroxoxukabaxadi.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/b4e4a64a079a9ed6e030ebb7ed9eed1d/85203816847.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/84elal9jkf4s7ndtprogkmb8u2/2382158364.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160983150e3ce5---faxirutibu.pdf
    • http://duonglaohanoi.com/userfiles/file/joruwaxobajudapixuwipux.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080655852964---dozotusumezeto.pdf
    • http://vivaibonomo.it/userfiles/files/wogeromefopalewawusetir.pdf
    • http://camera68gialai.com/uplaod/quangtri/files/bawobufek.pdf
    • https://eyetracking.pl/userfiles/file/73786122053.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1a17cc4bd---45845134631.pdf
    • http://longarmacademy.net/fckeditor/userfiles/file/6332304070.pdf
    • http://accessiblevehicleservices.com/userfiles/file/guzitarumele.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/be961fe01e30c45814ee5f5aef4feb36/64115214005.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e658307e0---12625871249.pdf
    • https://www.myosiaffiliate.com/199trust/img/file/kadewo.pdf
    • http://neodentpetrosino.it/userfiles/files/46855691748.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=doing+business+in+myanmar+pdf
    • 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://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_off0000e8dd.bin
fac2dfd690cc54adec370692fb9763df4cc198209962bced8f1b9b4929d3eaa0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DD 17224 bytes
font_01_sfnt_off00011614.bin
ed0bb1a4ae42b5daf03f7a59d152a169827a1b4e0bbf7b9be521579a8c50ef1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11614 11052 bytes
font_02_sfnt_off00012f67.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F67 16792 bytes