Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a752c910b4e5ba3…

MALICIOUS

PDF

91.7 KB Created: 2021-08-03 08:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3cf6908c14935d333bf7f70cb5b94d11 SHA-1: af572fe3b85d291ea01d59a5de163d95f81af34e SHA-256: 0a752c910b4e5ba3562343e9f27e9960d5ed4618de44e54b31ad9f18f04fee95
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a link farm pointing to compromised WordPress sites, suggesting a lure to download further malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely provides instructions to decrypt a password-protected archive, a common tactic to evade gateway security. ClamAV detection and ML classification confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606f68ea924cf---69048974786.pdf In PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160cd7160082a3---jasevisebesopebuwogokuxu.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/c31b689eee91071ce15c081abe3b150d/jaxekukalawom.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/37791509714.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/67a5142080fd1f2c2e7d8af6551dadf6/liwokon.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/10601393131.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160796277822c2---5939528486.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/74d8096fe20a368b0be50279b785ac49/wobugewitafiwexuxureg.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160825aad1d4fa---widavapepizidiwopofe.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/beb393d395438ca24551056f86cf8ab7/40748209345.pdfIn PDF document text
    • http://calzaturificiocatia.it/userfiles/files/xopenawegigawera.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/4fe0c889fea332fc6b1442e54add330a/luwodiwawowesokuvalego.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a683a3262a4---zitutegon.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a62ce5881d0de80235203d732e45c7dc/morisuwebogatisati.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/66094543687.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/21213048322.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/14853199090.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/tudamunoxibupisuxu.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/78286708403.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/gtk56laebam2a78kmip267gujs/30090318206.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/jutubodija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=free+download+gta+v+for+android+ppssppPDF 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_off0000fab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB5 19852 bytes
SHA-256: 50ec3feddcd76ad615e66388e607a2a1dea7e2ab62359a43c0cef3b4e64be54c
font_01_sfnt_off00012dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145D3 10804 bytes
SHA-256: 0abe784d06cf1906d66048de707a00a9353b2e9841dbb96dc9c7182c2f535c7f

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