Malicious PDF — malware analysis report

Static analysis result for SHA-256 f547d9aedc7c6b64…

MALICIOUS

PDF

97.0 KB Created: 2021-07-05 10:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ce0e0c45fc9768de7e363e075965607 SHA-1: 41e60a3210f1912fa5bc349f84cb63a2c9e60dd9 SHA-256: f547d9aedc7c6b64e6ef2272336bc7ab3caaf700851b4a0fadc5e730ba432224
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan distribution vehicle. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other disposable hosting domains. While no scripts were explicitly extracted, the nature of the link farm suggests it is designed to lead users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/b76e984d88dab2952df7a1e3bd54394d/zibuze.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a83cd2e64b9---fawosazefojiti.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/a96154355453386c4ddfe21f195f3707/13792703916.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b3386aabc---bimopowumidavexezimi.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989fd05f94e---10523827143.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/u91up1hov0d2mrhmhsi03hurqk/5452960697.pdf
    • http://landia-print.com/pdir/file/kidanosuj.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/vjd3v5mtdrqodn886bjiasvt6v/60639290160.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083776675cf3---kumajevo.pdf
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/74617149525.pdf
    • https://catequesisnavarra.org/guiarte_userfiles/files/96779250109.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/d01073101fcab42e0c95f02e41ede9a8/xiseraf.pdf
    • https://prestinireedcorp.com/userfiles/files/31785522598.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d0b67d561---44871021891.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608093cd58d0b---64528370639.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/8ab23b69fddafabe623513db9b2b0a7b/31371032640.pdf
    • https://eitmedu.in/ckfinder/userfiles/files/25061347009.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c144b4d090d---pabejebofozinaworakiwedu.pdf
    • https://nergizleryapi.com/image/files/mibuzi.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/3e810618f793b687e0c662e031689c6e/98151968239.pdf
    • http://accessprecision.com/userfiles/file/dupafare.pdf
    • https://shen-su.eu/gfx/userfiles/files/pasenixigaribisove.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160be4a9fa1e9a---47240779487.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/uh9ms5810plq3n02fiov1j5q71/95176090668.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=stochastic+integration+and+differential+equations
    • 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_off000115ee.bin
5a5db4f3e20285378b33b771b352751dd5111df0e97b0eb41543c7d401b2324d
pdf-font-stream PDF embedded font (sfnt) at offset 0x115EE 11076 bytes
font_01_sfnt_off00012f23.bin
491f01506eb5434397f7998d2cd5a2ccfd310dc1546b3b20cb89cbee34e6d8d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F23 17888 bytes
font_02_sfnt_off00015e91.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15E91 16792 bytes