Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0d5fd7f5473db06…

MALICIOUS

PDF

78.8 KB Created: 2021-09-16 23:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0b7237f533394e100bd52ab38cdd8830 SHA-1: 166bb645ba82bfa4d6cca587f3da9925e4d4cbe5 SHA-256: f0d5fd7f5473db06f9883446b3d77f4cf303f09d080233498ade77ed0357fc85
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple external URIs, including links to potentially compromised CMS uploads and disposable hosting, suggests a phishing or malware distribution scheme. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document is designed to trick the user into clicking a link to download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=vagrant+story+ps1+iso PDF link annotation
    • http://yeosingol.com/FileData/ckfinder/files/20210903_7E972268FA32CBE9.pdfIn PDF document text
    • http://metapolar.hu/tmp/75033123513.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/nutuzowijijasumo.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/59011772163.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/34399589961.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/tosuvemegiserag.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d83a5fd428d54e63896fa03e8f624265/dixumoregusesurubinuxosiw.pdfIn PDF document text
    • https://foulardfotografando.it/file/wapuvuniseririn.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/88997066520.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/55329612149.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/40348159830.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613415b654983---vuraf.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/towadedirufisewovenulo.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/g330adcheqnv8u42cohccb6kv6/90428792204.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/20483516460.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/pazudabexebirejotirun.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/fewiweruxepobanetulagux.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/38371494337.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/57335291828.pdfIn PDF document text
    • https://e-room.co/userfiles/file/tugosubujamipipudexa.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/46438710294.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/fasajesukusit.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/84650703670.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/076c869de6f29dedb7eea0e0194d60ea/sebupasubivub.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_off0000c790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC790 10384 bytes
SHA-256: d5a8fcc6da5e415f8b045085e2eaeb34c28ef8d419be39d4d5446421c971ec9d
font_01_sfnt_off0000df3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3B 20164 bytes
SHA-256: 70033cb97870b2c269fa1559fad491b959e5816a6361f60f3bf1458189f7da61
font_02_sfnt_off00011474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11474 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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