Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd3585d1e6034b06…

MALICIOUS

PDF

80.3 KB Created: 2021-06-26 03:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f190a1781b6019b7d5df5cb9b78e914 SHA-1: 0d63abbf4a50ebcbca10b5353994bfcd2ff52835 SHA-256: bd3585d1e6034b062ae947747c5e640c2cfcf1bd0c8f99fa4415264bd7cb761c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing lure aiming to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082fcae51624---xuvolofogedowezamalefo.pdf
    • http://accronline.com/userfiles/file/58154153012.pdf
    • https://advantagelic.com/singhania/downloads/file/24159283779.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160714e45dda55---lapedul.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/r4ct2hajupho55dmh5qvrcb1rn/mobazetewivuleta.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609642f264aaf---78625218561.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ne9ohqe9pkkcqpb99qpsb6v8l3/49997109039.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/036c29a7b3be33fc4159f722d65d3709/10662557686.pdf
    • http://palenice.net/obrazky_clanky/file/58096802518.pdf
    • http://beijingxinzhi.com/userfiles/file/20210510030736_2092501007.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/d21f331d7d2c4f193c77a1fe18bf70de/buzelotova.pdf
    • http://connect-senior.ch/uploades/userfiles/file/nosolosuxogujawemoga.pdf
    • https://fuchscars.com/wp-content/plugins/super-forms/uploads/php/files/a836103c4a4cb05a333a93d1926c8258/40336069487.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/aed48j43565l34pee9i915glo2/bosuwokowavegijawawep.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/8c9a20d69d3529e96fd46078eaec0212/74776689085.pdf
    • http://bulk-supplies.com/userfiles/file/zazodir.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/35bdb14589bd37f9e1c4a089a0a15ed3/sasape.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cab954cf364---43065435867.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a8729a8a1---wolojapotoroguv.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e70f0db7d4---2862751972.pdf
    • http://botosani.ro/img/uploads/file/50700532917.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/62e0852a472d5ade28b530e143ba8b42/34236986232.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/7878b6857130436344476d2d15dc002e/18530586533.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847bea3e08e---pubipiwepoxusa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=bmc+certification+answers
    • 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_off0000d670.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD670 16792 bytes
font_01_sfnt_off0000ee87.bin
888c7453eaa59850aff2ab98c27a687af9d4776bcdc0e57cacd6ac3930660b6b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE87 10588 bytes
font_02_sfnt_off000106ce.bin
e62caf7e4a50dced84802dc87368d9e60316647b35794e3b1bd229454d6cd764
pdf-font-stream PDF embedded font (sfnt) at offset 0x106CE 16780 bytes