Malicious PDF — malware analysis report

Static analysis result for SHA-256 45ecd8685d338360…

MALICIOUS

PDF

91.6 KB Created: 2021-09-20 15:35:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01ea765b486025032171e29496ffd3e8 SHA-1: 086985d6d8cf7f5076e1e62f72596169bf1670aa SHA-256: 45ecd8685d338360ad75213df8f811b6b624913796e70f5986fea70be4fa0f97
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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=language+of+legends+apk PDF link annotation
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141301336b9c---36773014950.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/wisomimafa.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144fb60c559d---18283387074.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/a8dc48ab5bb41a65d5e9973ed6a30bf0/gubifibuvujapudotelew.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/misapirezufasatogefeboxut.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/45737209767.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/laludogi.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/71017778639.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210915192027.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/3b3a8427fd9fb93825a4e7359fa84f6b/60514718399.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/46503793357.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/mowixofuxom.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/matojegele.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/57900263871.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/vorelefudu.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/subizolajisikixidakugepo.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/21688398836.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/lojumakedeki.pdfIn PDF document text
    • https://kiptep.ru/file/nusepoxikafagu.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/xusekomijugoguxawuzem.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/gopamogepopom.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161391aae0011f---fufepowurewa.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ab881d2e8---47698856390.pdfIn PDF document text
    • https://oriolefashion.com/ckfinder/userfiles/files/pefusen.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC09 16496 bytes
SHA-256: 5b3e8b7f0315bf0982c7c30bdab21a2fc9ae28700d5d47455ae040d0eacb69cb
font_01_sfnt_off0000f316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF316 23696 bytes
SHA-256: 3545e10e996320a077c83cb9131c7d96762b9015ea10cfa86867b25fb651fd56
font_02_sfnt_off000130ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000148c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148C4 10532 bytes
SHA-256: ecf8178aff3e6122c0a0dee9e5f00587075910f57af2822aa9ddeba3e61b0fed

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