Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc85e5e65d75579a…

MALICIOUS

PDF

68.6 KB Created: 2021-09-20 23:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6144daaee29c254a53330b847f883a48 SHA-1: 09d4f7fb182fa7b3f1b8dc2de22c6c8d7b6f3325 SHA-256: dc85e5e65d75579a3f9d6212b5d2be3436a316e3888a384e6a287c9ba35a84c1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to files hosted on compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://pujcovnanaradi-tvarozna.cz/userfiles/files/16112708231.pdf In PDF document text
    • http://jeanchapleau.com/userfiles/file/687282033.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/50812651290.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133de8cf2d0f---41846431893.pdfIn PDF document text
    • https://slotsonline.ro/app/webroot/files/userfiles/files/86029140065.pdfIn PDF document text
    • https://ikima.fr/uploads/file/97812291170.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/jakefefiwifesorotugiw.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/20226339785.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/fivibowomodeximovazibafo.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/56143901775.pdfIn PDF document text
    • http://taxfreepoint.com/file/fesimufipozelemugar.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/sokilizinubezosevux.pdfIn PDF document text
    • http://synfarm.com/upload/files/doxunonerovenola.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/44426842381.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/14651270761.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/vegapimugabexoxerefuw.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaf6804394---68074551597.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/pobevovepunugidal.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/nejamukapepil.pdfIn PDF document text
    • http://terrietanaka.com/library/files/26478068542.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/gro36a3u8nakq83dic79rha852/lubij.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/mipabaf.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/91511215939.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/kilozisevigupuje.pdfIn PDF document text
    • https://digireg.org/upload/95933448370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=2k17+free+download+for+androidPDF 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_off0000b117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB117 14276 bytes
SHA-256: afef598c764bf9e4e126ca1d398687918a0a20e372e3df82e34ce711f1291afc
font_01_sfnt_off0000d4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF8 10384 bytes
SHA-256: edcdcce72f9f6bca1e1cbeec58610458a235e505ee273c47881a027b4de166e7

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