Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a09cab20d240a64…

MALICIOUS

PDF

91.7 KB Created: 2021-07-29 09:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 90382a7bf6f59f575a1b452fcc06a386 SHA-1: b4e1b8d89d6fde09a0ae7a05247ca79b23f458df SHA-256: 8a09cab20d240a64c27d83f39fc642e50bbcd0472809c218c5fb98e895c71f05
204 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and presents a fake CAPTCHA or human verification prompt to the user. The document also includes numerous links to external sites, some of which point to compromised WordPress upload storage, suggesting an attempt to host or distribute further malicious content. The embedded JavaScript likely facilitates the execution of malicious actions or the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://svazekobciorlice.cz/userfiles/file/96942103776.pdf In PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e43446c89e9---relozu.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/2ee900c7ecd9a81dc14bdd4dc100efa7/72688902022.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d53a62467c---kugibetiwekowiwotim.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/14514982464.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072e1567f278---zanawavefefaburiji.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/39488065791.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609844cac09bc---levekixosudakeluvogiminaf.pdfIn PDF document text
    • http://sierrahighalumni.com/clients/878712/File/vupenesapitevaxegupa.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/77390fa08509ca4f19e6fec9fb3e1b7f/53136848749.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/35470475196.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/55316528782.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/remes.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/94917865733.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/11d0ebef0e6e9758be75acb46cc62325/vevevubusi.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/f78s13drmm6bngtk2ljh74klmq/48161242955.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/badunaje.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/8pvfj8k4infbk435ij9oh8df09/zuzafinozoxalipefebemod.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160c54cd854be4---tirifunokotatofotiga.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/559e609fd4b55d06dba8c0dda5e1d0a2/kivetame.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dd31ccb6c---jibikizileleponevo.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfac0292386---45736866038.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/gamiwejox.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/44315a8d64f032d526c48dc1d609a97a/89893092731.pdfIn PDF document text
    • http://dejede.com/userfiles/file/vebawozenezomir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=abab+rhyme+scheme+generatorPDF 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_off0000ff2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2C 18072 bytes
SHA-256: 1f9f62a448549e93d66f39273529133ded07ddc2a409edb8e6f3e27861e026e1
font_01_sfnt_off00012ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145F4 10776 bytes
SHA-256: 94bcdbf8b10e6c7e49338dd6f69a94416931494fb36cedb4478aca67e7f4555d

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