Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce2d5c6527967e08…

MALICIOUS

PDF

83.4 KB Created: 2021-09-01 01:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3374faf48cd1e67d63b39ed19b140643 SHA-1: 70e4adcef644b521137b35c2f4c9ae7c59d0f3fb SHA-256: ce2d5c6527967e089f0534705e52595ab5907e9882f4fcb8500246d6e2e6c3cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/161111ccd6f9ed---kinavogenowop.pdf In PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5815a188d5---sawame.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607632a99463a---83848634130.pdfIn PDF document text
    • http://chhsmahs.com/clients/8/83/83f479e57a8bbaec88b4a04d821ef24e/File/pojorajozosofutabop.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/78206861551.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/savuruk.pdfIn PDF document text
    • http://lafayetteconnections.com/clients/52818/File/70389649794.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed5ac49794f---88731971443.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/cbf402b64af8d4aa300e66acea081295/zesapikotareke.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/50993709981.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/rimuwopozexosileg.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3c98c3b5f---34125418623.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609161e35d94b---89260054631.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ede81a50f5---43062801117.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/89416681582.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607060d78fd30---lenufituzoji.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/22246341473.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210815050723.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bebc0a0b879---92111270590.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/paneboxodetolozasuwudani.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-08-25/210825124303489044mfwfdttm8ujr.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609241c79ddac---43442363351.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25836449679.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/62850598156.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=sack+worms+on+evergreensPDF 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_off0000e381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE381 16772 bytes
SHA-256: 7e77d78a3129e5263630b47824fbd2cde74f9d756025df4222969b0236129a44
font_01_sfnt_off00010ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC2 10656 bytes
SHA-256: faa304c8d04e654503d3c44985c529e01aa8c7a173d4cb2b6413c7136136ba2f
font_02_sfnt_off00012742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12742 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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