Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a29902c6fd5e386…

MALICIOUS

PDF

85.9 KB Created: 2021-08-09 14:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ad50a7041bcaac9087f03b83ef3078d9 SHA-1: 3fe3031f5bc7912d0b32c98569ae1a9b05cd0762 SHA-256: 6a29902c6fd5e386803e84e4bd8f4d98c55c4e39973d1a6a1f5af4b9d776a680
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://drafthe.ru/uplcv?utm_term=total+history+and+civics+10+icse+answers+2019 PDF link annotation
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad30c5a3a3c---nesiliminoruposub.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/91137997012.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/91262635333.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/48378491265.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/53137189572.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/vatawonilijika.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/91089660080.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/puxutadatizan.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/0c25d6682e11d1e84de34e50e0c4f6cd/73811849022.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/505b21f9db68d12187e6b2021c30bb6e/pixenomeju.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/1536729564.pdfIn PDF document text
    • http://holzweiss.at/71638136346.pdfIn PDF document text
    • http://rotang.net/userfiles/file/82822043646.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/zitetolip.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc3c983e06---6085104940.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/660cf79ea2003f5f161585ecfc16b70b/tubowalejifufajinen.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/jurujegisexawujirubav.pdfIn PDF document text
    • https://p87.hu/files/dozosonotedoxalixul.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/jivupuxemefizujarazuzonox.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a1872f18e---79692222029.pdfIn PDF document text
    • 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_off0000ea27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001023e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023E 11160 bytes
SHA-256: 8ec3dbf2000216197e2d611e487761355d148abe055cf7480a54c330afe83503
font_02_sfnt_off00011c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7C 16544 bytes
SHA-256: 2aeac86df6744cba0bd2bc81ceec4711685d279916ce2235374cbcbe459ffe6f