Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c6043f63df9dd12…

MALICIOUS

PDF

79.8 KB Created: 2021-09-07 18:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0eac7500fb1bd84f8ec3b81934523681 SHA-1: 506bd2400fafabfc2aa7a7993c3d2e7ac359a78e SHA-256: 3c6043f63df9dd12cb4d627e7d6f45c4665caed4b4ec89c611fd195c24cfd64e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://catamma.ru/uplcv?utm_term=ejercicios+resueltos+de+molaridad+y+normalidad+pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c62362425c3---5837153097.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/82pmfhcoa43kv6ndc0mk6jv4m1/31414533284.pdf
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/bisazekiwe.pdf
    • http://aps-mes.com/files/file/76342591198.pdf
    • http://aceonlinementors.com/userfiles/file/81130095207.pdf
    • https://genericdiabeticteststrips.com/userfiles/files/10428276841.pdf
    • http://brilsports.ro/userfiles/file///61561932532.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/c4f3d993eabde2b525fa1dff48bacdc7/82249138788.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/008611fed80c49cc45717c04b3eda321/43911827508.pdf
    • http://jtylek.pl/Upload/file/90683790935.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6501772cb6---42707671080.pdf
    • http://sns-russia.ru/userfiles/file/19418294901.pdf
    • https://aldapa.eus/files/galeria/files/95559544546.pdf
    • http://zimmerei-possert.at/bogifunemiji.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/hbt0cjflsta6jv4hk5sru86ig5/75936367626.pdf
    • http://hydrogears.com/survey/userfiles/files/mosefunojej.pdf
    • 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_off0000cf84.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF84 16792 bytes
font_01_sfnt_off0000e79b.bin
991b9e5a8ed1ae8e79318a9f0eabaa08d898bc9ca2d54a9d25124873c04ab1c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE79B 11108 bytes
font_02_sfnt_off0001017d.bin
6fa90a6cbcc91979767bf6606326c80a4bc990e68837ffad2a44dbac7a66c385		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1017D 18988 bytes

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