Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbee6869fbaf925f…

MALICIOUS

PDF

83.2 KB Created: 2021-09-02 00:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fd255566e30fbce5656cc6ec2ac13cff SHA-1: da10247aa980b3956b05d7cb9421dab6b883e779 SHA-256: dbee6869fbaf925f4a9b59337253c9908346308f237c98a82be40db0bdd12433
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains a link farm pointing to numerous other PDF files hosted on compromised websites. This behavior is indicative of SEO manipulation or a distribution mechanism for malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://catwalkdogcome.com/editor_upload_image/file/tenow.pdf In PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610de8da41a98---gunijir.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/eo3t51ok8dac76ff9cdjairvjg/97528551008.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/44915664395.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606ea7117dc60---laduzatediwusepogexi.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/14cb19714f7e01a6aaf7116a62179d6a/webipegoze.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/81285854760.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607825b20c2ef---muvevunarogugufun.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/pilaz.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/89120923110.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/5132935303.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/78017942245.pdfIn PDF document text
    • https://dietacud.eu/upload/file/jubujirobosoxozinozenef.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3ff242930---wazefotate.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/11850129896.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/19725083556.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/51842026254.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e11db3247---sapalodoj.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/90387709625.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/488aa7f37c3d963d628590a99f403be6/dexenibagedazi.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16083e1d783202---fatidoxuwatigurezetur.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/gotesawikugonubijozad.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/79495194348.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/6122bf84e8ea6934b7eca36adc82e3cf/gavetubofo.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffeb9e4016b---42619671350.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210605144730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=heat+of+combustion+definition+chemistryPDF 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_off0000db54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB54 11040 bytes
SHA-256: 96e7d4aa525622ef45073488f0877ea56caac7473879f35061f86cd4a517d6cd
font_01_sfnt_off0000f4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CE 18580 bytes
SHA-256: a2604c0ba49527be41ef461bdee5833b33f1490c983e8156487156fdba9726fa
font_02_sfnt_off000125e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1