Malicious PDF — malware analysis report

Static analysis result for SHA-256 575a51fc2b6c5a0a…

MALICIOUS

PDF

88.7 KB Created: 2021-07-17 07:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4f38da4b92965da89ded8c2d48c3dfac SHA-1: 0dc893224b354bc951bb97e47ac9946631f37e5a SHA-256: 575a51fc2b6c5a0a2428e7d9e7c8162277b01dacb474a5f53e88ef557f1d97b7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm on compromised WordPress sites. The document body is heavily obfuscated, but the presence of PDF link farm indicators and a fake invoice lure suggests the intent is to trick users into clicking malicious links that likely lead to further malware downloads. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a7388e24f---23457705871.pdf In PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2a2d1e032---soposugapagukaxozimud.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/fba3b2aff76b5bc23799c072b96c4148/porimapetogofaxaxozewo.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/d4ps5vs7bbjeqse1h2bj440od4/19512617290.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/2be2568230bc938d66ea1aa9183918c5/63221265850.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/58682181893.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/napuf.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/sovomevuful.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/vorikimorunopi.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/c3c5deda1e6244a0d4b26a6535bb3902/dajaxuwogefafazibefeses.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/ee3de8d67192c752b327ca9558f40af9/sanofirevabad.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/vituwutu.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/22277693324.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/dajuwepeb.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/milapurovezoluforazi.pdfIn PDF document text
    • https://inncredel.com/uploads/85562700101.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/a1e0466375a5b460c2041258d1c76817/nefimaguwiguge.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d39632cb7---89855205868.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca73e0b68---7154899291.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/5d9162548ff869831aaae59d59038299/83176006776.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/mamarenobuxebefilona.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/58f68528953d0b1f82c9010cde952e00/gewirotiwelavofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=meaning+of+tender+in+marathiPDF 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_off0000f3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3ED 19016 bytes
SHA-256: d923570256aeef1a0bdc7fb8c38fe1e0a93642401feea224ed29af9410786331
font_01_sfnt_off000125e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E9 10580 bytes
SHA-256: e26f8d5e819ba3b8b8f0e26f2f08810f1121f718acddcc9bc135161a9cb64b36
font_02_sfnt_off00013d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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