Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f21253c81b7c864…

MALICIOUS

PDF

76.9 KB Created: 2021-08-05 05:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c43fa90d48afd2dae00b32833df58c25 SHA-1: 400fab9607dbf6dbe83015bc4a347af182334e66 SHA-256: 3f21253c81b7c86401ed330218fcb2a46e5bc6da8ef60bfe0b95ae5cba634ba7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, directing users to numerous compromised WordPress sites and other disposable hosting domains, likely to facilitate further exploitation or phishing attempts. The presence of multiple external URIs and link farms suggests an attempt to distribute malicious content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=scag+turf+tiger+61+inch+deck+belt+diagram PDF link annotation
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/80c0911fd98708dfeb26e74c6582f133/28477252266.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/86062043449.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021060407320569.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/kogajisagiveju.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/17512810187.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16098c63843f80---jesupukidi.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/23736594721.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/peninuba.pdfIn PDF document text
    • http://hongdacable.com/d/files/dulipesafibi.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093a27f61dbf---24330028234.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/zuladadatagiwazinupa.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/fedinesavirefojunekabalud.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/f70ec39b93db52201c5150efe44876e6/tilonigakokoreraki.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/gemopubufidusepezoxasowex.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/fabataxovun.pdfIn PDF document text
    • http://cdhsalumni.com/clients/28864/File/78905395480.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08c19a7dbc---14303304648.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/53aa8dc51cbd7c8600778fbb3c2b9154/korabizimola.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a022c7960c5---butifikunefelog.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/tebonerezekolukigamit.pdfIn PDF document text
    • https://ccskin.com/geektic/files/ziboxototupetogagowobidi.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/mmb406fmgdk01820dv7bjdco46/rexoramuvinenonoweto.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///bireterebifuwa.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_off0000c949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC949 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE160 11260 bytes
SHA-256: 20b646d1cbf90431051338bb4911d587b6915b8d53d179fb98b2206e58e61d18
font_02_sfnt_off0000fb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB73 16372 bytes
SHA-256: 2f0db59994e20f9290ddc9c6f18436dd11d543bfc3f4c7ce04ff0be0ad368e83

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