Malicious PDF — malware analysis report

Static analysis result for SHA-256 5731714c5928af3b…

MALICIOUS

PDF

121.8 KB Created: 2021-06-14 02:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b1cd45b621ce89d695c07bbc56b92177 SHA-1: be1a1e919d778397bb0598b61452d297a7dd43b5 SHA-256: 5731714c5928af3b4dde5ee5f156982bcc00bafc23f4e63cc722ef1a0f397e8e
176 Risk Score

Malware Insights

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

The PDF document is identified as malicious by ML classifiers and ClamAV, and contains numerous links to external websites, many hosted on compromised WordPress sites. The document's content and structure suggest it is part of a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics indicate an attempt to leverage web-based threats.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pixomot.ru/uplcv?utm_term=add+maths+form+5+kssm+textbook+pdf PDF link annotation
    • http://ylpcl.com/ckfinder/userfiles/files/gatok.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/816b385d880c1dda74dd3fb805ac8118/puzibis.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/a2s7o378g7vhpall5c5dfgap2l/jelutedewija.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab64464517---95319964057.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb1095379d---92781630012.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/qfmf0qkktb23todh0mopf05pu3/409087550.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e7bdd8c26---90615685924.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/b8619ac1e10575ca290b629b162f78db/26495683793.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b359b29e56b---60368917783.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/3daff122531b612cee6edbf9bce65c77/85184076702.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/d2303768d53580430e6a08896d56f5db/25011939930.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3c45d00a2---31388949801.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/61018243012.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/13255035990.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/58722492589.pdfIn PDF document text
    • http://jfkanacon.org/data/userfiles/files/rebeturokuvukutekaduv.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/janepererew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.orgThisIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://scripts.sil.org/In PDF document text
    • http://scripts.sil.org/OFLAbyssinicaIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16874 5636 bytes
SHA-256: ef05f1c4e6fe30363478000134b6a271d76831fc82f5915885f885b917379d69
font_01_sfnt_off00017b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B71 20800 bytes
SHA-256: bba9576470de41e535966f17569f857e7b0191683ead4d5680742beb5432ade8
font_02_sfnt_off00019b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B1D 12112 bytes
SHA-256: 3302994c9b751aa7a8b50be139dac96725a5aaf73207450e44b12b0792a812cc
font_03_sfnt_off0001c4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C4D9 16072 bytes
SHA-256: 4ce97752c8d1ed0b0302a1507788019c6b738cc3ee96ca273f61f92c287db7cd

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