Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf343e7dcec84a4…

MALICIOUS

PDF

87.1 KB Created: 2021-08-19 01:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9438aaa81934c503ad558a2125ca8235 SHA-1: c9496f81bf3d6c0cd34b6b1420cbda73c53a74a8 SHA-256: cbf343e7dcec84a4f031fb5168435c98e73f521cad110069134eef2b69ba7eb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to various external URLs, some of which are hosted on compromised WordPress sites. The presence of numerous links and the use of disposable hosting suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://infrive.ru/uplcv?utm_term=%D1%81%D0%BB%D0%B0%D0%B4%D0%BA%D0%BE%D0%B2+%D1%80%D0%B0%D1%81%D1%81%D0%BA%D0%B0%D0%B7%D1%8B+%D0%BE+%D0%B6%D0%B8%D0%B2%D0%BE%D1%82%D0%BD%D1%8B%D1%85+%D0%BA%D1%80%D0%B0%D1%82%D0%BA%D0%BE%D0%B5+%D1%81%D0%BE%D0%B4%D0%B5%D1%80%D0%B6%D0%B0%D0%BD%D0%B8%D0%B5 PDF link annotation
    • http://stlukesmn.org/clients/17773/File/67851064939.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/98bfa9119a65dc1c7d97127394eb6306/43752386864.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b518d35369c---wusirujos.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/5582703790.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/rukepegajalanitixil.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/e778aa13e4b0dd8044bc6106a6d97ce9/sekakazavoxukexi.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/8774325860.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/nijor.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69659801596.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/fubixaberexeniset.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/tafofarun.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9654b0116---fafolitanonejeja.pdfIn PDF document text
    • http://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/32832463162.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/b3a326a1c254b369598e684b63ae800e/8458305949.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/jinap.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e9834b476fe---wadusugix.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085738bb70b7---29626603854.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/xoselovutimuze.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/72771921178.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/mikaravimopogo.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/savesupetetejazefagijo.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160abcfdc56e42---nuwosag.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/2de816e039b058555de582f60ed2e97e/motenefaxivatidirosomu.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8ec42fb18---bakuporoxagidenizewad.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b939f21ff8---xunevavixolubuniboweluvik.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e33a02afcb2---jiwujina.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_off0000e5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AA 20688 bytes
SHA-256: 56d3741d62530ec862bd86b2e934924e7eeae3a06ab1d199f31c971f5b66c321
font_01_sfnt_off000118b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B9 11020 bytes
SHA-256: 277a1d4845c339ad889b149aa63016cbd323cbcdd615ecf999803d851780db10
font_02_sfnt_off00013245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13245 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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