Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcfdbdc66971a663…

MALICIOUS

PDF

83.4 KB Created: 2021-07-22 00:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f55d45b8f350884c1e957afb4784e7b4 SHA-1: 525542069a6e64a66e7cd3340ca94a2963278076 SHA-256: dcfdbdc66971a663a2092a2fa0d4b947385c9812873a2b7d412b8614e69397c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF functions as a link farm, pointing to numerous distinct hosts, many of which appear to be compromised WordPress installations. The embedded URLs, such as http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f5bb08e76---4156252912.pdf, are likely used to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/afc9e12adc4414fcff631b2721a2483b/topiwu.pdf In PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/878d4eb03149cb256f142475bd8385ad/95203199019.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de47aa1fa2---sadidalilanilepim.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f5bb08e76---4156252912.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/60bb8c94401fda3c0c4ae0fdc578f351/72522550884.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8650e6c1e---pegelasigimiwum.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/sgkddf3gk98u9q98asrbils499/feseditut.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/p1ku9eoljgn61421qvh8f29q2l/91337806257.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609617fe190c3---69051907676.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/c05cccd0feb8f10a58fff3053ac812f7/19609689991.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/26450038199.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/23500849017.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f7efcfc12---17972657457.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/32190339690.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/56058769794.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site//site/data/files/zudezazaxuri.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/zumususekegofolipenifab.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/omvtr6cacjndp237i9789o32mm/15345078127.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/50ba300c1346950c47f4e95727c19bf2/71398620907.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/c73c5f686d4340324e59f66b3cd570c1/rasepixobixenifulosijo.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210626080135.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/0bnt1ot5sa5h7nhep3hvva6eu3/61992509327.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=the+unholy+releasePDF 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_off0000e1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C8 17848 bytes
SHA-256: c532bf8072c103c48c34d4240078c5657f0c195642bc67bb09b3b8e03d18b579
font_02_sfnt_off000127b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B3 10192 bytes
SHA-256: eaaa29ba3cb3bc5a6a03f24165c922b20fdb668a43ad6638fcf54503b779a639

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