Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf0b65c71e3ca837…

MALICIOUS

PDF

86.1 KB Created: 2021-09-04 17:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ba929fae4293af72186599163a731478 SHA-1: db8a808ef8a9ed8ca771c2cf0667805a0f7aa598 SHA-256: cf0b65c71e3ca837a6c78f3b529c3fab2b67a30240964c5796eba196dd2ae407
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a link farm with numerous URLs pointing to compromised CMS uploads, suggesting an attempt to lure users to external sites. The presence of these links, combined with the ClamAV detection of 'Pdf.Phishing.Trojan', strongly indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079edd12dea8---94976306672.pdf In PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/d3d579c3401fe4db5c6ee34af1af8147/boxupalanifu.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/80297861641.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/vunixalaxanedufek.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/94287319582.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/sagoxofajamem.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/18975888409.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/xasewexidatowojizopomam.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/lepivupijebutodimir.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745138034c2---3598598147.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b48338d41ae---11822976593.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/rusiwekemizobepakozu.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/26677226254.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77410269725.pdfIn PDF document text
    • http://blueyee.com/upload/file/031225499357.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/48992920578.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081ceb85de7b---kuvigureru.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/30510322641.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a43c82ef0a5---39816752431.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/kozapalokikedut.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609719491075e---41291331550.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c89ff3b31b---48241631549.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d2f80e91a---tenobevezasenosojaxakame.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0809e0042---jebinumuwoxulaginujefi.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607af2210a260---46863685107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=lloyds+pharmacy+heated+tens+machine+manualPDF 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_off0000e651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE651 19192 bytes
SHA-256: 81371b71baefda531bec0ffc63359c628c64dd9125a4f6e06ec34ac36c36662a
font_01_sfnt_off000118d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130ED 10948 bytes
SHA-256: ea4ac825ae66bd6e9b2813cad8c213aeb31631e0a9ea2522a764bf35d7ee6cc4