Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc67b9d6f2aad9f2…

MALICIOUS

PDF

100.5 KB Created: 2021-06-28 12:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b8e7a46cc437af87133e942522948f2d SHA-1: 987e53b713b8331b0634d889e9efc3205e8fa01e SHA-256: fc67b9d6f2aad9f2f2fd69e1cb96827fb2952b58b258ce1ca91ff1b243b013b2
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, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://wastran.ru/uplcv?utm_term=apollus+ehs+solutions PDF link annotation
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607754d39a049---31340727130.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/38b2c743885acc2b88f7a4b0f4e4c105/22694638792.pdfIn PDF document text
    • http://uamarkets.com/images/file/pufemodaku.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/73707257918.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff04fe456b---37718332284.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/bdsmcbduv1u702g4hglskq3j86/25778154601.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac77c9d95f---buravok.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/27003849833.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/7a40d7c7109042223a688aecc17d4e6f/79596684456.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b161267d1e---ximenenizulaponixa.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/43567803340.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/871jkc9092v0665l9meaktk8q4/wunaporikevoruleta.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c38b936d8e6---rowilu.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/uu4gem6kalhv81vjh3m3qb2hk8/87990885293.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///94910912399.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/d84ab1a82e476a7d79e0f8159d6628d0/lonotojobubomeguxexi.pdfIn PDF document text
    • https://chp-travel.ir/data/file/dituxegiriwizosemakiwino.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608662ff8effd---pelabeva.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/duperipe.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c06fca163e---69664180074.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ec2745589---59687193916.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/92386192185.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/90498174452.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd99c93b13f---11712967637.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_off00012162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12162 20892 bytes
SHA-256: acdd37723457b69f3180ef70d2fb64291ca1424c11f8369af8c41ccbf3c22e40
font_01_sfnt_off0001546f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1546F 10168 bytes
SHA-256: a8eb6f99ad80e3d1ba8c3eb7998187ffc9ccaeefe2cdc8aa9766606279b17e9d
font_02_sfnt_off00016b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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