Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab01b2e3f0c620c…

MALICIOUS

PDF

80.2 KB Created: 2021-09-03 04:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c79e28d7b9ae4a7a6afb327e85d112d5 SHA-1: f7f8c6a5cf8c17e091b843b3dd99d90658b5b678 SHA-256: 4ab01b2e3f0c620ccc5b2af488a4f0bc125f63ae5be4b05d071475b13c9ceaba
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests these links are part of a link farm on disposable hosting, likely to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824dea6d706---89889792737.pdf In PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1606f380d65759---46118301242.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/wereseta.pdfIn PDF document text
    • https://faltprasten12.se/anvandarbilder/70/files/31015466418.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/tufusigagaka.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/firemikegojugafomifu.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/dexezuk.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/28310b4dd6f3e487587ec4204150eaa6/6731357480.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091108aab1d2---pitok.pdfIn PDF document text
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/50897966647.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160809abde2c01---62068932905.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/zufimugopajikamemusafizo.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613002a95888e---ligijuvusofajexujot.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/veburijaxotedexobig.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/wosuloxozu.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/47672641321.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/36718155553.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/72g16lai1uglpiisd9uu48lih6/kewotiv.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f83c31e737---vemananajaxarogoleji.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/3a44bfb38ca227c45327c2521c9010da/rewedurodijabi.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4e2f79594---rubesalaraxar.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/6204151737.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/lobebakini.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/95374755243.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/pomomigobapexemonigine.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=bad+blood+pdf+theranosPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC414 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_01_sfnt_off0000cc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0C 21836 bytes
SHA-256: b247d3d34714201e722bc98205424e053c9b1aa9f860fac0f074935e97022fca
font_02_sfnt_off00010218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10218 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2F 10696 bytes
SHA-256: 92919a0304b66c2d158ca9d51c32dc9253364111044123fa206aeb635302448d

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