Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39b43e9f6ca52ed…

MALICIOUS

PDF

88.5 KB Created: 2021-09-06 19:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2ab9535141dd120d13f1fbcd31a25f1e SHA-1: e980da302eb8b6c7ed877cfc384e9af1bec99552 SHA-256: f39b43e9f6ca52edcb3da1f6200a8b687950b73799ad5d6213dd5cbbbba7b14d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress sites and other domains, suggesting it is used to distribute phishing content or second-stage malware. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=el+marxismo+en+la+educacion+pdf PDF link annotation
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608188ceb86a5---datukuva.pdfIn PDF document text
    • https://labelmarket.pl/data/file/sofiroruxexikuvi.pdfIn PDF document text
    • http://inistor.com/ufiles/files/wevasusokinule.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0fa73c5dd---nuwavinuxubumedobipulabez.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0f9514ca9---3496388294.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608650cfcf47b---68489159130.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a6daf127e---jugisowevitivatuxe.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/47082728006.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/141000404305.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/setug.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/19695387650.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/zusedifefagab.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe41681799---duputitewo.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/4144268390.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/vipusabetasuxiju.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa5e0741dd---77025930350.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210806212317032.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/lavulirizevu.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/l9if0fh7pshho2g6k3p43op48b/62561745676.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/e97bd965fb8851323b5c487f3ee8bff5/baweba.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc4b579742---92888031708.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/tuzavegonotiviv.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/46129257041.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/gupukafet.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_off0000f548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF548 18152 bytes
SHA-256: 29a66930480074d8fb1a13bc7b756f00456a2993b0122be736c11231f49d8ccd
font_01_sfnt_off00012315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12315 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B2C 10868 bytes
SHA-256: 5c2e09b0aa0498874f9ca2338eb8a9422408d0a0aa686d9f6e310b8f65d221c7

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