Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ad5ce88da195659…

MALICIOUS

PDF

88.8 KB Created: 2021-09-03 05:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 82e0ee253cc518383e98ebf04b94ea62 SHA-1: 4d2b543a87d0d167065cdb48861db03544aa5be7 SHA-256: 3ad5ce88da195659890e6fcb8b3525f68e7fcc06adef62c5562d09c3b358aa84
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no explicit scripts were extracted, the PDF structure and heuristic firings indicate it is designed to redirect users to potentially harmful external URLs.

Machine Learning

  • Nyx PDF Classifier clean score 0.1617

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 http://firewheels.pe/userfiles/file/45414554839.pdf In PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/f08da197757ddca97d00cc4634727404/navujutujosufavefafibudit.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/rufegitotujazulapap.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/4b104dc37d1f28eb6a45400537f2422d/47808174550.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d8f346c37---51477924913.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/1c30f7mbdv7e7r9gts38ehq5ol/3680405058.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161290a2785894---28134539758.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/dmrkmgq4m2qbaoohkriillbee0/bejonok.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075353bbdde5---17621946927.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/bulonetov.pdfIn PDF document text
    • https://schmitz.cz/res/file/96682871201.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c549ecb298---27750022769.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/832beec8e8037381aaffc3b928b6b12a/51850142631.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/24412864036.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160701616528f5---katono.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b07d32c9d---88649047552.pdfIn PDF document text
    • http://iwishop.hu/file/21244736676.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/60c5f3877c61a3da0d47e5c33a2e32e3/92451319424.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608362b1a322a---xenebisibukiti.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/ziladutabigezab.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/5ape0rarp01ng62jht0qhcv3kg/61435651395.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/redigesupoferafeworovonuk.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/8230264fe6003989df19e22b8b24d309/jekidimosomomowevu.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d40e75406---sefitogifufiwazafug.pdfIn PDF document text
    • https://anaksemut.com/contents//files/mozukejosawolebexima.pdfIn PDF document text
    • http://acril.ru/ufiles/files/lovuki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=division+worksheets+third+gradePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F3 19544 bytes
SHA-256: 49d1bc1b4d9782339f5135a41a7c7703c2ea64d3517a97da08597d4e80fb3321
font_01_sfnt_off000148ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1