Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d8ba15ef5e3284c…

MALICIOUS

PDF

90.4 KB Created: 2021-08-17 06:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ec41fb7802eaa7e2b5ea4d60c69ae598 SHA-1: cd99c3318f6d8ba6c7e79caaa14b0a1e73be6d4b SHA-256: 7d8ba15ef5e3284ce69da32db36b8c47342fe00aa73350f3147dcad4ade0c4d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://krisoc.ru/uplcv?utm_term=calendario+2020+colombia+para+imprimir+por+mes PDF link annotation
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/fb84fbb451898573f4ecf7fb4c7d1cf9/21026717707.pdfIn PDF document text
    • http://proxima-design.cz/files/file/paxanixupexutozivasinaki.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/b410ceabfdd0f44a728b37753baa3401/93727109201.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/wuzepuvufo.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/36126774951.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/49015855919.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608337fdd731f---sobozam.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/d43a8201b22e3cf8dff3c540f4eb52bc/zutatidopugu.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/98316540007.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606ecbc51378a---41765223210.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/27336606778.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16085e8f227e4c---1975928939.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/59700876674.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/sewedutozu.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/l4k2atuv7aobq6f1e94u00nl53/kejuru.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/38790727487.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/1f7e409b714b270b64371f03ded3a177/56440907120.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/pakisogibavazofiruxegilud.pdfIn PDF document text
    • http://immopolignano.lu/images/16920864651.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/1995e123372a36dec313a9811bfd5a01/5496055868.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/87613743208.pdfIn PDF document text
    • http://amtutoring.com/clients/865321/File/43031814057.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC04 17684 bytes
SHA-256: 20f4b8c5edcc0dc989a500023f300e916cd9533dbde8b1d487449c1d18e2cec6
font_02_sfnt_off0001291f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291F 16224 bytes
SHA-256: da79484a7f94e028a8871d907a282bdc2df095dfef79f7b1f2af1efeeab75da7
font_03_sfnt_off00013ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC5 10992 bytes
SHA-256: a8c8de384574c681f4334d80db097012970aeb049c5764ca21b67a0291858c80

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