Malicious PDF — malware analysis report

Static analysis result for SHA-256 29dc10308cbfb386…

MALICIOUS

PDF

78.6 KB Created: 2021-08-18 13:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c6e93164747e4fe0f0352ecbc46f1bbe SHA-1: 57e69a6c63ba7b48073dd60352ec2ec13cd1a9ce SHA-256: 29dc10308cbfb386c943cdc34ad541045a96092cbceaedc278578267b8784a0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate 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 https://suprizpin.com/calisma2/files/uploads/76718669401.pdf
    • http://opt-russtd.ru/data_center/upload_pictures/file/vajaf.pdf
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/53353473006.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bc265477b---94774428533.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/3d17569d416209e44a9ed914b592e247/17933078840.pdf
    • https://graveyards-fuj.ae/userfiles/files/74130014090.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62b960557b---26013096604.pdf
    • https://store-connector.com/_upload_bilder/_filemanager/file/besisidazosuxaragasa.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982f37ccefb---61600731664.pdf
    • http://obras.ru/sites/default/files/uploads/kirotifexif.pdf
    • http://szzxwx.com/Upload/Upload/file/20217292150417137.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac01e58ce13---18728575141.pdf
    • http://cyc.cz/pictures/clanky/files/vozagiwapatekuvunazovefi.pdf
    • http://centromedicoveterinarioadda.com/userfiles/files/bozesira.pdf
    • https://beautyyaurient.com/editor_upload/file/sijijop.pdf
    • http://aire-limpio.com/img/editor/file/lalakatugozewubexef.pdf
    • http://xz-brand.com/ckfinder/userfiles/files/78325857280.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ccee4a113064a69f0de7d9b0faad44b8/vafibu.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5ec84ae81---77235460255.pdf
    • https://fa-vietnam.com/webroot/img/files/dolodeli.pdf
    • http://goldnumber.info/userfiles/file/soxobusixifaxolo.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/5b4397ab84b8f30e342f96baffd127b7/repakimefo.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8b80ea15b---wavijamuf.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/c458ecdb60c08dbebb13dba88e0a22bf/40251800134.pdf
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/74769500871.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=appositive+phrase+worksheet+with+answers+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_off0000d138.bin
b03a7f41c4b24f324b7f04c00d11f323684019aface93247e02968461fc36b29
pdf-font-stream PDF embedded font (sfnt) at offset 0xD138 16520 bytes
font_01_sfnt_off0000fbc0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC0 16792 bytes
font_02_sfnt_off000113d7.bin
dc93c4c8aec582aa0279f2f188f209bfba62c6f19286afd2376e08922b339938
pdf-font-stream PDF embedded font (sfnt) at offset 0x113D7 10776 bytes