Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a94d4d77524cc61…

MALICIOUS

PDF

87.0 KB Created: 2021-08-10 14:15:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b4311a2117e226124b54f265a56109aa SHA-1: 9950871f68fa448b1e803bd714b18c8c6defc394 SHA-256: 6a94d4d77524cc615d36d7d070a7b130d02e511595971191c96c1929c1942727
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or redirection scheme. Heuristics indicate a high likelihood of malicious intent, with ClamAV flagging it as a phishing trojan. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6a083472d---xawixatojafezazol.pdf In PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8af70b208---42101081684.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/vgn9di41lkg9e4b4iu2ce4q6j7/52882481819.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610ed640b0dcc---19383756683.pdfIn PDF document text
    • http://dental1970.com/clients/5/52/52cfbc2c58cc98a1938bca6351e90795/File/gagijoratixebodobapok.pdfIn PDF document text
    • http://superpart.com/files/ribubule.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac23be4581d---jasomu.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/76801773962.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/bokugenexexazuviv.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/76463556542.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/9593fcea18b25b3f3bbb3c95ca9be299/3231922550.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/fimaxabinesafegidu.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/muxeziwuxekimuta.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16081b79bb8725---lodulebu.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160989eff7f7e1---puvewaxizinadifo.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/molifilefinaxu.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107ea6bbf012---38531576714.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/46066203918.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/15851285245.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097088bef144---32219850233.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/78e705392e6eb5414efe52e1345a43cf/gesejepupalizibife.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfbe744491---43244936783.pdfIn PDF document text
    • http://feast.to/upd_file/96142970500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+make+a+claim+using+the+medicare+appPDF 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_off0000ef2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001073c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073C 17232 bytes
SHA-256: a4a2eeaa5cf044d3e949f529f82bfc6da61915900ea9c85ba47ade9cc8a853d0
font_02_sfnt_off00013475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13475 11228 bytes
SHA-256: 583793ceb305dd41645da25a60399a1da78fc03d0045ebf13f7b16af31038487

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