Malicious PDF — malware analysis report

Static analysis result for SHA-256 691d7f6337b1a2e0…

MALICIOUS

PDF

91.6 KB Created: 2021-07-31 01:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ecd7c2b7018edb37b8e86d8d288e8826 SHA-1: b5f814e6da70a1401ac3f08f0e5e86a1755ae26d SHA-256: 691d7f6337b1a2e06ab99aa2c69ff2e124b4d5b91b94f4e02009a39652b889be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous external URIs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The primary purpose appears to be redirecting users to potentially malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/bixizegiwuwizotikelam.pdf In PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/68783383692.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/julerajipuzetof.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/ledajaxuxadomon.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/4106609945.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ff2f56136425d44894d47b84ea9ecf64/safujogemep.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/40380858641.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/1c271517489d0f6dc753d395078de880/95232051172.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/81986432967.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/87853991978.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/73604963419.pdfIn PDF document text
    • http://www.77ice.com/upload/files/89013710791.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f4e95791b---541538503.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/a5df57c9c881e0679145cf3a5e5d8c63/tizurabozutunepudomote.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/vidowero.pdfIn PDF document text
    • https://kede.org/userfiles/file/gikomojonolozob.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/d86bb9a2b6152d913fcad06bdec45c86/jigizejobejobor.pdfIn PDF document text
    • http://gtshotel.it/images/file/95542609357.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802a6bc9b2c---75734212173.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752e3e89604---judevaranamepilu.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160703fbd08749---56526507935.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2978a27ff---siwajinusifuxebifotolare.pdfIn PDF document text
    • https://izr.fr/files/26513996446.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/tasurelenegakumilid.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/20735342425.pdfIn PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/zikizazevutoxadosevukit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=clash+of+clans+valkyrie+attack+strategy+th10PDF 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_off0000fc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6A 18952 bytes
SHA-256: e608175ee22d61c25f5dda846fcd2bbf1b8be4b01805685a381b6ab796d48347
font_01_sfnt_off00012e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2C 11092 bytes
SHA-256: 3d2b82651be447d9a26b3e1aa2ebe69fb7b5c7224064de5b45920723f4e45ecb
font_02_sfnt_off0001481c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1481C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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