Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd926791c57c126…

MALICIOUS

PDF

100.7 KB Created: 2021-06-26 13:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2a46c44095b598033c4eea8be2e68a1d SHA-1: 50a2d8c2e27424e81e2c475eee8de23fa7b3701f SHA-256: 4bd926791c57c1264669a92f12381f4f1eaae5e754293acc02c900a1d122321a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://inwebjor.ru/uplcv?utm_term=ps5+release+dates+games PDF link annotation
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160952393a7c9f---kamuvatobubisizogolevev.pdfIn PDF document text
    • https://goldenapp.net/file/niguvig.pdfIn PDF document text
    • https://songhong.info/userfiles/file/57537281342.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/84dcc5219f558b30d0b89e956dcf5ecd/57366889066.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8c3c50c56---rudebilotija.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/thb3ijdrfh37n0dug1irc3f5l1/defatixa.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af785e56eb---fotuviresakokera.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/fikokolorikagolekajeji.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/0e89373e2eb76fb488ba078f17b40102/mumuve.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88783ca122---jubewarixabobakevudelovud.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/8b29a8f31e0b2b324543eeda94997df7/86141200253.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a5d543515---zitokelaxisizusexinuw.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/35719734065.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/52700019357.pdfIn PDF document text
    • http://imbirimbir.ru/files/55353550233.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609baab94a35e---21324401998.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c4c281716---dexesoselikibuvaruwejowu.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/583011374.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/pipetiwid.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/e9ee2d9dcfd406d68cffd0e159659b4b/rejajitogaxelufetoniz.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/36769226975.pdfIn PDF document text
    • http://hopkinshigh1966.com/clients/1/10/1054c114374c88b4a165e91103565d41/File/tafupefuxagajopunuzuwi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001103c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103C 18096 bytes
SHA-256: 53a8c075e3442f21a7508517441870b9e91f1554a7e294f994c97b11d51ba42b
font_01_sfnt_off00013f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F2B 16064 bytes
SHA-256: 6be8c0c042521f5a71df7666660e0ab63b9e07567b17aa495b0122ea571483c6
font_02_sfnt_off0001543b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1543B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C52 10408 bytes
SHA-256: 956a4533ee4739dcbb69aa845697893cee10f23293998e262ee57d385ce96ab7

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