Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cad4c90cf28dfb8…

MALICIOUS

PDF

92.6 KB Created: 2021-07-20 03:33:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6ef2012b77057fdb58b33ef41f0048de SHA-1: d2d67205c5b1acd618c32963c9e89f7c4a7018de SHA-256: 3cad4c90cf28dfb8ed9f536c67dc9c4592bee8dd002ee87015452481a6512a0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as a link farm, directing users to numerous compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The presence of multiple links to WordPress upload directories suggests a pattern of exploiting vulnerable websites for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160d42d391e32c---suvametibu.pdf In PDF document text
    • https://austarpharma.com/upload/files/8568049795.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/tonukapuxowizixubo.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada8145d1d6---37098584773.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/43006834313.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/ec2be8af5cf2723f9a69c340dd16a8a3/30792472819.pdfIn PDF document text
    • https://12shio3.com/contents//files/boxavejivatixexitumamuxo.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/fukukefebijowenar.pdfIn PDF document text
    • http://oakgroveschoolheritage.com/clients/b/bc/bc5c94904a1f00f1300372e6f875146f/File/89421129715.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/vuwoxagofufatu.pdfIn PDF document text
    • https://lncl.org/ckfinder/userfiles/files/51858576611.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070425f32cdc---lebizitas.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afd8e7e4c5e---44672303554.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/1a77eac6885ab17402d393bdef462ee3/61062181784.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/46579959389.pdfIn PDF document text
    • http://ibb-online.ru/f/file/zamajunul.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a61579024---32024976005.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/93303313026.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcd2354f9fe---81049430855.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608babb1ee36b---98199963991.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=ideal+gas+to+real+gasPDF 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_off000109e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E7 17140 bytes
SHA-256: 67a888c8d9d49da06dadc2f352893dab31804e73961f94b210f69e23d523b53c
font_01_sfnt_off00013705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13705 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F1C 10180 bytes
SHA-256: b8795e05574a8c10e2028559a7e9f5a7f43785d7d1b9f998f845caf87556d22c

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