Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb66f6d951c23ef…

MALICIOUS

PDF

75.1 KB Created: 2021-09-03 20:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 066c99829c25dcaf0f0243a5d6eb3033 SHA-1: 75730d05e92e79e9a8a2c2fc2c9daade02a93890 SHA-256: 4eb66f6d951c23ef4d99b1cf609d24b91a3820fec691ff28414826b5c70d7c98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and link farms points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://inwebjor.ru/uplcv?utm_term=hospital+front+office+training+manual PDF link annotation
    • http://xiaohecollege.com/d/files/42604097161.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/mutel.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b164d3da6---favukitadenazuranod.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/5qb17mnads4hm1h0jlj6tps6mr/7926105001.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/fegopepavenadomelep.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210806162155.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/60858878695.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/saxakis.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/274c3499774d3df2f85cdddc7133686d/jubesepimujagozis.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/j3bj6k15d1u23lqi74btp4p971/megimananezalanuluvozow.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/dtfo1eebovgfpl4jnghbtk9kps/76012943866.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/26d3b4e5c097ac9a02d777237802556b/zakejoxemolusi.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a631e267ec8---94665251787.pdfIn PDF document text
    • http://ciskmv.com/css/file/73308579679.pdfIn PDF document text
    • http://giga.sk/storage/file/30449713957.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/79734e04160a621e4e6c564c45e2841b/motozi.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/52492939193.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae38010c731---44012151178.pdfIn PDF document text
    • https://ilmercatinosottocasa.com/file/nobukerubuf.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/e1a6bc90b8c289181123d5c9f1715353/73367159421.pdfIn PDF document text
    • http://ewtch.com/upload/files/xiwonejavifawa.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/93213660678.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16109b922b53bd---21070229533.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926fd422047---41766518442.pdfIn PDF document text
    • https://izr.fr/files/18515260236.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_off0000c673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC673 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE85 15416 bytes
SHA-256: d2277b6711e4a7cfee2e822f24485a2b28872032120ed4aa9adcf67f9979c5a0
font_02_sfnt_off0001056a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056A 10916 bytes
SHA-256: 6d1b5a97ccdaea1e204daae419055127d1a78984c0aa8dbd3d80600c66ee1bbf

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