Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ab1dc4776506ff2…

MALICIOUS

PDF

85.7 KB Created: 2021-06-28 07:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12c834ff5cc0dcc144e798834be4c6dc SHA-1: 8793b6665cd341a5686002cdfa70687013b11638 SHA-256: 2ab1dc4776506ff252c4898b6521b33229f863ddced891ff79e1267e10aa3865
156 Risk Score

Malware Insights

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

This PDF file functions as a link farm, directing users to numerous compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The primary attack pattern involves luring users through a seemingly legitimate document to download further malicious content from these compromised hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16071e770a1197---44418987192.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/4691a49360493bd15ab1b2349a4684d7/30426099066.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aeedc18f2c---97714240846.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e172b226c0---85551828480.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/56b0vu8e1umi3538kqqa9hr594/nepifiwesanutupupi.pdf
    • http://naturallabs.fr/userfiles/file/22532815375.pdf
    • https://triosms.com/userfiles/file/marijuluditovo.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/nrpl8hgce6gl9k9qtk5okbu8cv/14442815512.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/4f1j0ab894p3b4usvor679684v/45989237304.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce20e537f7d---zugixujexutojubelusiw.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090812cd8c44---pubafakefi.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/74173367677.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823044dfea7---81940486234.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/9962f6a3c714088f0af0662674f8cc22/73530625068.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607156d110583---98707723287.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608075791d056---61734072068.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c857dcdf012---76922540214.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/ni2nmndm84h0tlj706tj7ue8q1/pagabe.pdf
    • http://vekosgroup.ru/userfiles/file/83425602462.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b450358a30---bigadi.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160893556ce2de---70530319552.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606fffe6a46b0---pigeme.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/8beca1b2d8509fe0c84c9a87ae2b7fcf/47549740463.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cc108f5bb---linowebidupaf.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=assigning+oxidation+numbers+worksheet+answers+chemistry+if8766
    • 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_off0000e9b4.bin
14acec1cd306a11c4b67aebb234996039bde73ccbc924c9541b3ef016a1db185		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B4 11920 bytes
font_01_sfnt_off00010619.bin
5ba0e981e0d49676718bf95f363586e2a3b6e9554a34dba03764afaf12d2b90c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10619 16420 bytes
font_02_sfnt_off0001309f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1309F 16792 bytes

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