Malicious PDF — malware analysis report

Static analysis result for SHA-256 a42fcd007c602345…

MALICIOUS

PDF

92.2 KB Created: 2021-07-10 03:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6953ca34d7f97abdb58d65f7e771a73b SHA-1: 0d76a643eb42b9ce061ea55605c5c7a5495fdc6c SHA-256: a42fcd007c602345e0642bd621de3e54ce5f0b2d071b7af536b578448dd48c07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to compromised WordPress sites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or download further payloads. No scripts were extracted, but the structure suggests a link farm designed for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/236b754b6f9871229c9b2956ca6580d8/2202546116.pdf In PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/ab0c470b25696fc406edee1e65b1f152/56952296655.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/03d4399e5c5dd2d715a789d378b12e34/sadunepapujulidu.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16089a13d98912---ruvaxilipenemuf.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160765e7c9b88f---firixipet.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0187cc59f---zulaz.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/8a675f337f515dea0f3585fdfd3df9e5/wipuvazewibivakebo.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/j742vu23tpj9f34he4leq3aql7/vukifujikuda.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/kosevule.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/34919742877.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160829b1f2da60---21600405765.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/2jim8vhv1ctq7ju69jccjprpt6/58745005318.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e62f86ec20d---22659410494.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/46824612252.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/23282544816.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7aef5f325---9587770552.pdfIn PDF document text
    • https://austarpharma.com/upload/files/vuxuwusofiri.pdfIn PDF document text
    • http://tw-go.org/files/89714344038.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/8dc83745289c32edcc4214e62f1312f1/fuliloxojawud.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210626_222849.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/gedamogojinosis.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/wazogekoxi.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/1672880f869fed41f155673e3d198864/24933070195.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=meaning+of+veil+of+incorporationPDF 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_off000105a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A6 17404 bytes
SHA-256: 8fa07287434deeea5765e81b15fe5da63f9f2d9b026f7b273fc9112d88899f0d
font_01_sfnt_off0001334b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334B 10548 bytes
SHA-256: 471f85d81ab53d77884d177fb5bd396b812ad21af59309b373c5a236bb7c0ec5
font_02_sfnt_off00014b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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