Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbff18625554b964…

MALICIOUS

PDF

80.6 KB Created: 2021-09-10 19:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 98068a58da4fad1941e02440bba98ab0 SHA-1: 70219e8780c8e33a1f1514983f0ce8c629d96ee0 SHA-256: cbff18625554b9647f73ddc3520725d72a820c07b1d8e9d0704f5281be4c95fd
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of numerous links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://sicilyontable.it/userfiles/files/56511504807.pdf In PDF document text
    • https://padservhosting.com/userfiles/file/16338192774.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/35589648214.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/putadedujikidedakomaju.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/33860342735.pdfIn PDF document text
    • http://videocycling.info/files/file/77205073771.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/vosagiko.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/94608545608.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/558b2c8cea7ad33bdba8e99a0d4e8f06/tezerelegupalatujurup.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/74339552462.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/jifamatuj.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109101300036703.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612effa71c381---33699637756.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/91932187227.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613718769f559---69851144235.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/saximolepejefowow.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/tixefanimuko.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/15121471430.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613114a900eeb---28270098408.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/65184336133.pdfIn PDF document text
    • http://dsfly.com/uploads/files/tawosamebefikuxis.pdfIn PDF document text
    • http://cobmedia.hu/include/wukujanuxumajibuwagagupuv.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/nepalepisegaram.pdfIn PDF document text
    • http://schokozentrale.de/idata/47106920030.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/vawefabovapuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=saints+row+3+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_off0000d4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C6 10504 bytes
SHA-256: e2232ac6ea491887938024035a33c16ad6f2423f63f5c8177a5e1eddf99bb085
font_01_sfnt_off0000ecd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD3 18400 bytes
SHA-256: da569a2cd572161d45088f1128a35abc3e4b32797dda653f5f83379d3da08848
font_02_sfnt_off00011c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1