Malicious PDF — malware analysis report

Static analysis result for SHA-256 055afd9b25668f46…

MALICIOUS

PDF

87.7 KB Created: 2021-07-16 14:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aba026e22097dff4224a9bf4cc7b968c SHA-1: 67e0928a2ad244e7912539dce4a2c0da75479f48 SHA-256: 055afd9b25668f461b998f234141235c3effb6cabdb2d359637d86396adfa709
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous embedded URLs pointing to compromised WordPress upload storage and other disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, but the presence of external URIs and link farm indicators strongly suggests a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://infrive.ru/uplcv?utm_term=linux+commands+pdf+with+examples+free+download PDF link annotation
    • http://asupuro.com/user_data/image//file/87695462131.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/ripaxujapubibepigume.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607944a9e675d---93706422713.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91df10988---6056827107.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/b57f448dd15cb59a88781b9bc67a91c2/jokexilupadofupimutuvipo.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/silunarifugatufusisova.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c21e5db860---kodepufesizivirinun.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/papuzuzogufa.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/78924872022.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e50e06bea---wivenozumepif.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/tajafexodiviva.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/97447781022.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/32572568424.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/03fc1c24ffdd11651d8a413a92c3a1f9/12877991780.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c85b91c11a---desugumumuzubewogu.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/doretu.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/padl3jn0khrsrnro06uclmohc0/26602034381.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/15954426805.pdfIn PDF document text
    • https://bamor.org/userfiles/file/zikevebeziwazejarap.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/b1f4659edf9a8f4f95779fd17bc3c5e5/xedetimiwovuxefuluru.pdfIn 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://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_off0000eed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED4 11128 bytes
SHA-256: 72bd1f3e28eb2adea0522f04cc449d31f12a065356045d0aad13a1dcc3530cbc
font_01_sfnt_off000108af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C1 18060 bytes
SHA-256: 95c2d0e3d6012d9301ec39fd7fd4250e351e8927c09e3cf18bd3558bdf77084d

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