Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b0a6a29d9389a8…

MALICIOUS

PDF

88.0 KB Created: 2021-07-01 10:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87fcbf60e3e2b978adb3e5a361fb6ab2 SHA-1: 093b49463fca77633faedbfcf7c0c4249a7cc0cb SHA-256: d7b0a6a29d9389a8a9cfbe04a9e349a5a87fedad3303bf5ca514e8ddcc2efb81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true destination and potentially track user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=the+hills+have+eyes+dog
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ufva4634b4f5j82vqdgir0qmt1/kojerofujexasosifesu.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1314958d71---38142034249.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/v1anej1e7617pc617vpbnl8ns3/dizanamawesekasakiz.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b467a0ca1f5---gonate.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/40493e6cb81bf6bfd2c8cdad8b73cb40/97029873523.pdf
    • http://minhledtran.com/luutru/files/zolivurasomonax.pdf
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/535bb0d61641fa71fc0c6f24c08cb246/85616118465.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c385f29146---41584453694.pdf
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/8569d4b8bb855ca941ab56b1eee36357/rejesonusad.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/4bibbsatn32mihmjeeu2liqai5/97715741404.pdf
    • http://jagodkaprzedszkole.pl/userfiles/file/78614986355.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/c28b767efc0de1e2484a13cba995e88a/susotedo.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/6a394eb0tjme0v3de6c7d2r5i2/62174862517.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/s1pcip1o24ov00mndd83uailm7/sesofozapoxotulalififof.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/59337308794.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/50c7b6cbf7a8bc86049a4572694f68b1/febafuvazilafef.pdf
    • https://questyme.com/userfiles/file/37435082810.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca299d3339---47389718914.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160858404ee4bc---larakitugatadufux.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d79b6a1a4f---sanirojivupodedogeregadol.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/nelexi.pdf
    • http://al-bandak.com/userfiles/file/33870770964.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083973fe8f2a---rixidujuvufakuxawojosev.pdf
    • http://triatlonbizuterie.cz/sites/default/files/file/10061939538.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_off0000f5ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5ED 16792 bytes
font_01_sfnt_off00010dff.bin
8a3894552cf8a9b8be4834fb65c1c3e8a5db233fe92ef25d207e0bac1a883679		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFF 17304 bytes
font_02_sfnt_off00013b47.bin
4ee0c4c10cecd77cc5b7fb0c885333bfefbf539f6f47da2e0590f5eacb495e95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B47 10368 bytes

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