Malicious PDF — malware analysis report

Static analysis result for SHA-256 44dc281565f77be9…

MALICIOUS

PDF

87.2 KB Created: 2021-09-06 19:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a60788414f28d8b80636b94771ebb287 SHA-1: 188a1f1edff948d18dc391067af668be90fc716a SHA-256: 44dc281565f77be9a5d98cf6625624624b2d6ecd809eec19ba404261fa7f367f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised websites, indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pepinieramontana.ro/ckfinder/userfiles/files/21281921473.pdf In PDF document text
    • http://cermak-expo.cz/data/files/file/lewotusenatikejogulod.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/47414873351.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/gizapikorubi.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/xurelivoxawasigozomu.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/40796701591.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff608eca07---78994212588.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ccc6b699b---jugezirelaj.pdfIn PDF document text
    • https://renault-service.com/userfiles/24990098877.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/27811885471.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/texetivejenebemokimalar.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/61763094345.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1eda425abf---22258594562.pdfIn PDF document text
    • http://www.samlab.com.tr/wp-content/plugins/super-forms/uploads/php/files/289382qeb2h0pj1l6qclovmqbs/68424417406.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/89468298927.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5c8f465d7---vefoxedejatusonubi.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/750216556.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/46316957644.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/d6d697301f9a1d842eedcaede7945775/zapokuxivufiba.pdfIn PDF document text
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/repupixet.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/kakijejesakali.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/50749159170.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160769161b536e---17228410875.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/82928360657.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/tosomit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=ap+state+govt+holidays+2019+pdf+downloadPDF link annotation
    • 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_off0000e5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FB 11384 bytes
SHA-256: e2431ebaedf1b2ed5811a9705bc204cc4ea00feac98d10af09c3c9ca64541665
font_01_sfnt_off000100c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C5 20580 bytes
SHA-256: a241258cd35a1cb46983eec5959c4342ade38d3cf2883c389350266a6215c527
font_02_sfnt_off000136e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1