Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b68dedaa665db3f…

MALICIOUS

PDF

73.7 KB Created: 2021-06-30 03:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 95770d636819a8348093cadd7b9ab3e2 SHA-1: fa3763bb57b5404f01e27b776fbae6dd35cfb7dd SHA-256: 1b68dedaa665db3f3df40ce80f1f46a5e2beeaae2162e1b0a3e22848a1e7a74a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to direct users to potentially harmful sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://oniceh.ru/uplcv?utm_term=how+many+high+school+credits+do+you+need PDF link annotation
    • http://palyavalaszto.hu/teszt/upload/file/fajixasabokavuvazizal.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/63555479507.pdfIn PDF document text
    • https://welltowork.org/wp-content/plugins/super-forms/uploads/php/files/ca787860670558b5696a5e34efb46f4a/92770629561.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f040ae9feb---22847464874.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/wajisarujisipozenu.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/91162695218.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/bosomipofamomesigikugaw.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/64e27830e628ccca0c97070340f94f99/8201160338.pdfIn PDF document text
    • http://aweibel.com/Photo/file/worojedujaxoxot.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/10985862369.pdfIn PDF document text
    • http://klassn.com/ckfinder/userfiles/files/14289867498.pdfIn PDF document text
    • https://invest.pl/userfiles/file/45464769269.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098bacceddfa---10911201850.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/435590adc7010c3885a665936d67f6c1/40611834542.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/290c6a0b9a7693d5f33cfe27170ae712/vezelopumafakusito.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/0u1m836kt61ka5brjvitutlrqg/vonirosofafuvu.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/8f00f05848d59e81083ca69ecf1ff410/68650416251.pdfIn PDF document text
    • https://brs.jo/userfiles/files/12958165880.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/3ef8f0ea2c95faefbf1dad0eb4ae3c87/wuzakakusisetixiboluse.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af5a77d768e---nuzuleruvef.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/50f727db8d2d322190401b9be4d12e4e/81651431344.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/634bfbab719a585677fd88bce1f00e16/55694427466.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_off0000beea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEEA 16000 bytes
SHA-256: 93bf3ffe2f015fb9da41f59eb3fd060994a5b9a03486d0544bb50088780bf0ae
font_01_sfnt_off0000e7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFF 11108 bytes
SHA-256: 6f05194c15e9f3b0bb87327f0e2a3dfa090ace58e9dbf21f46cd5f4bab808d65

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