Malicious PDF — malware analysis report

Static analysis result for SHA-256 21aeb7fbc08b0e9b…

MALICIOUS

PDF

89.5 KB Created: 2021-09-07 02:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 99ee5c24fd175ab94d9880b11bf40a4d SHA-1: 4fe013beaa7027a61449f0d5066d400576d76bfb SHA-256: 21aeb7fbc08b0e9bbab3c5009a88996849ea61396182193aeabdbe1ddcf8344b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to WordPress sites utilizing form plugins for file uploads. Heuristics indicate these are likely link farms on compromised or disposable hosting, designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://archism.ru/uplcv?utm_term=wh+questions+worksheets+doc PDF link annotation
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b077660811a---vitajofokupepetezi.pdfIn PDF document text
    • http://flomojapan.com/upload/files/43046508565.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/f81orcmbev554ej09h40t3hs39/wixemirolodozo.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3idh0a06psbs3dbrqkdl35g577/lavovasorapuxogipe.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/fugivexirusituruxoguzad.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/99505653406.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/sixusuzowuxevatefusi.pdfIn PDF document text
    • https://oumkua.com/userfiles/file/zudutopa.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/nuu99a3qfis5378jog8m8p1m9tgmtqoi/92102759719.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16076b82aa43ad---22941111746.pdfIn PDF document text
    • https://inverpalmas.site/aym_image/files/63475931495.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/33npjoubhhpvi8ih0rhghuje54/56446645162.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/matafomofap.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/803ad4901e823f5add0ebe2b56d31ca9/fugivulatasowomujozipodi.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/57539819341.pdfIn PDF document text
    • http://vitrine-prof.com/files/podilepig.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/52115918939.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a9d02f025---delareka.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/29090e1d87524364b1b624536d79e74f/40070686750.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ddc4aa774---43456651479.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160931d6c8d697---zaravujowinef.pdfIn PDF document text
    • http://splogservice.ru/content/file/9863715840.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/70399180101.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/79400528510.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ccd84abe28---duliximupo.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_off0000f880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF880 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11097 10676 bytes
SHA-256: 78f8a7b85e2a7439943528e837c85ab4ad041841d1685b06a78b2e8c4f2c31b3
font_02_sfnt_off000128e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E1 18192 bytes
SHA-256: 2ccbe5702ea2aff155235e1272ec65586cd7284f5f2ec4b13a3a73b277b65d8d

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