Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee610283f784c7c2…

MALICIOUS

PDF

78.2 KB Created: 2021-09-14 15:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d6391db06fae47ec439953308ba5b5ef SHA-1: fc438682156322203beb7acd60dfba5384bedbe9 SHA-256: ee610283f784c7c2069f699a4af274e101d593b61c598ac10d79ecaff639ce79
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many embedded URLs pointing to domains that appear to be compromised CMS uploads or disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dsmpqebo9ga9gn28hs9pu6050k/siludokawabe.pdf In PDF document text
    • http://cancunday.com/travela/img/files/rumimanukonez.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/padafolomi.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/53969898950.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/sevuvugemegomanolimifum.pdfIn PDF document text
    • http://evola.it/userfiles/files/87973469743.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/61410911753.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/wirowafaj.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/44946676724.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/gewamo.pdfIn PDF document text
    • http://mayphatdienngocquang.com/media/ftp/file/mukomu.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/ramozenebal.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/60954988514.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/bfpjsk3ho14920nmll83ru21js/77534163094.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/53601926.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/mozadujupemomarosit.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/59523784002.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/zadabap.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/fagus.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/girigorikeleludupaxuja.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/42315293514.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/60440011813.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fca03a2dc---86536033987.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/vadesarozutogipudozunog.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/42517533081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=test+lan+speed+androidPDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFB 10348 bytes
SHA-256: 890d062d5af3fa2daf63f0057d762639dee42a1784450c2e5b54b90807c707ea
font_01_sfnt_off0000e370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE370 18088 bytes
SHA-256: 0d71556be7ed5484ba81dfb95f912356b28232d244418fe0cb88d1e22a0972b1
font_02_sfnt_off00011332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11332 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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