Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b9c9c890cb4a7f…

MALICIOUS

PDF

139.5 KB Created: 2021-08-30 13:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 938c65ecfab9c2537c17e3dfeb5dd9d4 SHA-1: 0cfaf597638f42732788a20685e078103d8dfbd6 SHA-256: c0b9c9c890cb4a7f33246bf30371dabf5e8c28cb6a3f38d65224e347a4c30808
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users. The presence of multiple distinct hosts and UTM parameters in URLs further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://smidgel.ru/uplcv?utm_term=asteroid+meaning+in+english PDF link annotation
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a85938aca01---vuxovubibe.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160705c242a6de---67744282597.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160eca963bc889---wupegizidezo.pdfIn PDF document text
    • http://mahlkoenig.nl/app/webroot/files/userfiles/files/ruxezulasawujoxasopol.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/rf7786341kdai2djjtrnd4f4u4/xokixesona.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071ac3f5e537---pobalekule.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/defasiduxekagekawarerosek.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/magenawifapunosurajiw.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/85474170893.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16089c58f29b44---81766363712.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/pikigawa.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/4b85b4f03786198815e4e3afa7f89cc9/xopavib.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/13646311592.pdfIn PDF document text
    • https://mytopics.it/uploads/file/javapajegugozezipomo.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/zuzoj.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/1rvnnqg2k7fhm1hpj23k0ja6rg/munekixulamijapavawonufig.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610809e640d34---jokexa.pdfIn PDF document text
    • https://adikmanis.com/contents/files/37083490648.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114f56501283---muniri.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/rupomalufurisovogi.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/kezomekol.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/jusila.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/velek.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/telusuv.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8b8da2c14---87103607936.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_off0001b5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B5F4 10676 bytes
SHA-256: 8dc9af76a58554b2be89bdb014d0d9d7dc000b836bfa528b6a4b18a2559cab6c
font_01_sfnt_off0001ce06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001e618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E618 22124 bytes
SHA-256: def6ab102077fc9c415dcac44ab4e00df5fd7dd38294505990bb961c6a7b53fa