Malicious PDF — malware analysis report

Static analysis result for SHA-256 68fff8bd2c8c3f26…

MALICIOUS

PDF

91.4 KB Created: 2021-06-27 05:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ae283b15c5f828a6299f9f49dc9b8ab SHA-1: 5b812767619a14af348da483a88e34e24b29d3e4 SHA-256: 68fff8bd2c8c3f26d2875b5fbbdbb654215318d9e202b68831aa83bf29755a9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other domains, likely intended to lure users to malicious content or phishing pages. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nomylo.ru/uplcv?utm_term=hymns+of+gratitude+songs
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/1fcfbd2b4e9bbe352d5b57d9d3021dfe/rivatedidefeduk.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f1a2387bb---kabamixoz.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/plte0rr5bujku4ho74ht8qicf2/xasetaganuvikonile.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb27762529d---39842579096.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d7893b94d---gudutipazasesizezaxi.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/44c675d3d19cf02371f75db91f45e900/70107678205.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160885d71977f2---sosexudur.pdf
    • http://kondicionery-fryazino.ru/upload_picture/file/58646570288.pdf
    • http://botosani.ro/img/uploads/file/59581454593.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c248e0cdc4e---miwubofum.pdf
    • http://medicapoland.pl/uploaded/file/sidolumirinabilu.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c7342fa6205---xitajobovi.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc13ba55f0---36790521435.pdf
    • https://mn-lawfirm.com/box/userfiles/file/tixezolap.pdf
    • https://stmarys-perthamboy.com/upload/File/73307733017.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/d49ce4768b30ac20acb42c74fc83535a/97209961187.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1609214d11c68f---33329484426.pdf
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/askj8qv32jhni9jvp5bnl8c3ea/pomodutirulifa.pdf
    • https://jordan.si/dokumenti/file/76643329759.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/c12fbb7ffde0656df80939e1ce7a2770/86155371562.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5fd572f9d---lunapipi.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/154dcf3606c4e64b2bced371f03b749f/61844685376.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/31c31ae8371dca675d0429dd1dacf323/2216336121.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d0acb0c1f---33639073921.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_off000104ca.bin
4b39fc28c6dc1588095ebb3ff2e5583c5d006a940ab7e5705b22af19b569caad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104CA 16504 bytes
font_01_sfnt_off00012f90.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F90 16792 bytes
font_02_sfnt_off000147a7.bin
cbacb845909b5d67e1f8fdb9ec2d02c72ec24ed86a997c2dc4cecffd69bb0a07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x147A7 10856 bytes

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