Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0516b1bfc62cdbd…

MALICIOUS

PDF

86.3 KB Created: 2021-08-02 02:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1c1a40b5a35d8a59ed42ce3c8cf6fcd7 SHA-1: e3945f1bdf16edd8c020eb27271fea633aed891c SHA-256: e0516b1bfc62cdbdc79db338f2c61a73b7f106e1b695e088eee65dafe0a5a149
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm hosted on compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of multiple URLs pointing to potentially malicious PDFs and the compromised CMS upload links suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://smidgel.ru/uplcv?utm_term=can+i+install+apk+on+android+tv PDF link annotation
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ffea70d77---razurefexutamekikol.pdfIn PDF document text
    • http://beiks.info/public/file/96957239691.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/4b3ea1466aabdc55d7960fee446c8de4/84028067028.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/zoselopabokadikitazison.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818b82575ad---53159833557.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/15311189917.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/vogagejemi.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/revigutisomuvimusufexot.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d3141e0de---pejeruvegu.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/64978889955.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/24247822811.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac70cbcaeb---90120602083.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/15912806805.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/906b728982db0d1f17c8fdc3c2051374/sigabusogox.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16100839503056---senujukudaputarulip.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082358064140---lanuxofuvetuloxisazu.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/sivonufe.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/65692753574.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/gozixiberewawegaje.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/3e6efce3889f32aac2ff56040642e157/34668184554.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/8dceca8e327f5a8937c0403aaebbaaab/90514589557.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/rumiwapepefo.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16072a08b88b94---6128533130.pdfIn PDF document text
    • https://atl-50.com/files/file/74624496286.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/riponedidugibebiwuze.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_off0000ef6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6F 16880 bytes
SHA-256: 2294159c7d05c43c413853db144ca56420b82a2d3879a9798d7576ebf0057467
font_01_sfnt_off00011b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B39 10440 bytes
SHA-256: 2c9d4775b7009433f2c7efc5e49caf1d4c07a91b835c1bdb73ada467452e3a5e
font_02_sfnt_off0001330b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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