Malicious PDF — malware analysis report

Static analysis result for SHA-256 336376f0fbc44110…

MALICIOUS

PDF

87.4 KB Created: 2021-07-21 04:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a45be6a6d5b0aa9c577de9bf819fddfd SHA-1: fd912778893dbec0f53e7f832ad2317b607a5c84 SHA-256: 336376f0fbc441103ee4dff1223afd3fbaf27434f715a9bf8ec38d2905968d37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's part of a link farm hosted on compromised WordPress sites. The embedded URLs, while some are marked benign, point to suspicious PDF files, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and URL patterns are indicative of a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/d43c62f2cf610119d1d219b574bcc56a/lubenesosugubigolavalu.pdf In PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/35500422631.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/pd3sotv2au93ltnh9v766uk7hp/92138144690.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/xonigo.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607157b478c70---sugemezojomi.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/1hik131uosb9ct23rrco58d06n/27842777174.pdfIn PDF document text
    • https://mauspro.net/upload/files/pamenasomizidobumefaso.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/39784071300.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/032a2cd15fbfcdbb8d13439adec39061/56971838972.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160762fb8dc8c5---pamipagu.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/vp4g396gm92oa80agpep45nb1b/vigukok.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/8eede5382fde840abd6bbc68b87c508e/migejulel.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/e0f536484590dd3e7ee402440ce9f5eb/50814991182.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/lrflnbce7kn2rgpcsg2c2j3gmj/farimufa.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/jedolukope.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202107/1626567855.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///xawalufap.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/93099403883.pdfIn PDF document text
    • http://iwishop.hu/file/kiduzuxavujawejemevomefas.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/21174417698.pdfIn PDF document text
    • http://zubrcup.by/files/files/60619642499.pdfIn PDF document text
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/sepawak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=acpi+asus010+windows+7+driver+downloadPDF 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_off0000f2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E9 16836 bytes
SHA-256: 0a55eac5e31d5cfdc1e90bf7e96d4bc3de595a468da381ffe7aa2bbbb437349e
font_01_sfnt_off00011e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8F 10868 bytes
SHA-256: 22a95298828fcd384cf6026e383ab4cff2fd5759043767c1a8c52328f1f9be52
font_02_sfnt_off000137f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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