Malicious PDF — malware analysis report

Static analysis result for SHA-256 46f8d97f95df153f…

MALICIOUS

PDF

91.1 KB Created: 2021-06-25 21:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f9ce6aa123aa69efa403b3c23ac7d610 SHA-1: 50e4446ebb26926a71a5939f0c1d897dfecc67be SHA-256: 46f8d97f95df153f5a69a6e3300b390b6a406f7589306dfdfac9bafc654dd14c
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous links to potentially compromised websites, likely to distribute malware or phish for credentials. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

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 http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb115bf69f---worogepiwugodoxutamim.pdf
    • http://cokhihoangvinh.com/uploads/userfiles/file/xukofusadalapupagavogopov.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d35fed677---39111995241.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/3937a6df8ce2ab2f579aa6b92575e3ea/lakexevovoxi.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160743c4845efd---papik.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/tt51f0aebborjrrv268k7in9g3/jorewopejawixuwivem.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/361fd8c161aedfd2c837938add165503/61226247063.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/tgqcj3s3399p6c26k2lg0lihae/41672681679.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c86623b332---pilofetezudisudowewu.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16097625e8de53---gaduwewigafakajuvir.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/b0cd4f064f232eabeb3ee9571d06f353/tivomutu.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abf7e4a76b0---45575049430.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/7b9859fce9d289b88dad581d57ac170b/pexebuje.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb80f1df40---67276896786.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/c4d9667fface7464e592a45dde834b2c/28495986851.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903e10336b6---lerazugovovet.pdf
    • http://fenotropil.ru/userfiles/file/mewarofuwagubirix.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606de6c664606---zujamejiwipujaxodo.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/2a2996559b34736bdcdbb68a3b00427d/delinujowosovatora.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa1dc7dab2---20085044838.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d16f5d944---semus.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/7075dd2008e83ff3f6fff69a406e02e0/78125711563.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/85cc24033286eb82cf56c8f48c78363a/18588709036.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946b86c1375---10114927595.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=sexual+health+questions+and+answers
    • http://janyska.home.pl/_mjanyska2013/fotki/file/25433394769.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_off0000fb9d.bin
d9976557e02c22df3af54efaf9c6343550516c7429044fb1a04d8d1a20ca700d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9D 19916 bytes
font_01_sfnt_off00012e38.bin
dfd78c673b59ee45afb0b10df1b508962e0cb2d6368b1069e7256e672dbc17be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E38 10856 bytes
font_02_sfnt_off0001471a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1471A 16792 bytes

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