Malicious PDF — malware analysis report

Static analysis result for SHA-256 15526caea9c07fab…

MALICIOUS

PDF

89.0 KB Created: 2021-06-30 23:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10446d0e90286a78abdb90fa0e2d0e02 SHA-1: 2e3a4a6af6dbac8be8b4f13b39498dfa7423841e SHA-256: 15526caea9c07fab53e252cbca84e8ee69d82cd6107d5026fdc8597f0df3f4af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users by directing them to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://universal4shipping.net/userfiles/file/85328738666.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d42f7930a6e---solezul.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/sv5gn2om9k41nbdcroe9bq19m1/tapobixemoxefaf.pdf
    • http://rzn-house.ru/upload/file/pidimubew.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/bnmgfhmacegpek4u6m9lehvi15/57649323961.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b01d140421---wajelulabevugojuxonapewiz.pdf
    • http://hf1968.com/clients/48820/File/fumovuzelafar.pdf
    • http://www.aqsclimited.com/EditorImages/file/54818089033.pdf
    • https://t2sc.me/userfiles/wejevonefitenibekojiva.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae037c84807---81722708584.pdf
    • http://sacoorhealth.pt/site/upload/file/bodipibipumobu.pdf
    • http://animalscipublisher.com/files/upfiles/file/91252477538.pdf
    • https://accuratesearch.com/userfiles/file/fexufipagibapoxevugovolaf.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/450304cdee2233a917ec5f4a101bddc4/54495550660.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52f559764d---10195468842.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/500254f0e42b1882e44ea3cf6f087f76/xelevuwuxikudomotudol.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=wire+fox+terrier+chihuahua+mix
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb84.bin
f79a46c1162c97741a3010df82fccc928989dbb473e5d4f8394a5cfc802f825d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB84 10476 bytes
font_01_sfnt_off00011364.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11364 16792 bytes
font_02_sfnt_off00012b76.bin
ebd9300954010c7807134401fc4a6d03faf40490f65ae201ae2e7aef85c97085		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B76 16940 bytes

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