Malicious PDF — malware analysis report

Static analysis result for SHA-256 1061ad62b5ce1645…

MALICIOUS

PDF

74.8 KB Created: 2021-09-04 23:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44c0e383c7ad1453619d97f83e77ef6c SHA-1: 3a388593300f85600d858d849c39974aa4abcbf6 SHA-256: 1061ad62b5ce1645005dbc5fd9c06dba463dee268b2b5c75a01077c174a620d7
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or domains associated with link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO spam. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings clearly point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5478

Heuristics 5

  • 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
  • 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://luminex.pl/upload/file/bubudadosirumikuboba.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/jqml4tl5jr0jqejmc6nnqfasr4/77341521601.pdf
    • https://laatjehuisweerstralen.nl/upload/file/dalemamiwogilosewolilo.pdf
    • http://www.tobywells.org/media/fckdir/file/dozaresizusatekowimajoso.pdf
    • http://micronforgacsolo.hu/UserFiles/file/39349228440.pdf
    • http://logopeda-empatia.pl/content/file/11828922909.pdf
    • http://hrudolf.com/userfiles/pugetu.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160944a7e7e03c---wamodumevut.pdf
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vavelojijowesidabil.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7cac5743f---vidumopesilimubenum.pdf
    • https://dm288.com/slicice/file/tevaw.pdf
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/kizipidanib.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/993a26f18c8ad5051c88afe9132cd779/23996452156.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160becbcd59f61---82776016651.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/8d9e965792f09ee55cb202fab99a115c/rumirugoxuxaxobitujeg.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/5eb5fd068dc53b533a38fcc1f77ac1d1/95909232176.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161208b391eace---7155427123.pdf
    • http://garderoba.sk/images/_file/73752849432.pdf
    • http://espacioschillout.es/images/admin/file/41274671072.pdf
    • http://primeasset.hu/fileok/file/fonawulese.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e215b6774bf---48598984253.pdf
    • http://store-connector.com/_upload_bilder/_filemanager/file/dopizasiruxe.pdf
    • https://pass-eco-energies.com/ckfinder/userfiles/files/zuwogufofiradaxa.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/ua4io8km7tdn4sgvh2v637b1i0/xasunoluxedur.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=honeywell+rth230b+5-2+day+programmable+thermostat+manual
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A6 16792 bytes
font_01_sfnt_off00010fbd.bin
d1b58ffb0c48ae656e70ea6503a52bb67f26905bb9d63b841cfc7d9303e356fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBD 11760 bytes

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