Malicious PDF — malware analysis report

Static analysis result for SHA-256 8017067f9001b86c…

MALICIOUS

PDF

74.2 KB Created: 2021-07-16 06:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 562ab3f4f2375aa0c6f864ef5fa7a951 SHA-1: fc80fbfffd65e4a0689b1d16151e6b19f4f022c0 SHA-256: 8017067f9001b86ce7ba78a9243ab58aaacf9f2169b8027f3a33c11f360cb7cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are consistent with techniques used to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=the+odyssey+socratic+seminar+answers PDF link annotation
    • http://asustainable.com/global/file/65265184117.pdfIn PDF document text
    • http://kfbi.ru/content/file/soges.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/sukunezapate.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1c33ebd5c---zotezu.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/nusaxigeruw.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/aa0e119512b59bbe2f4bbf9a0edb7464/nuxeveza.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/pojilumupinidor.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/wevukigawijezosonisuk.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2874d063a.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/wegemuwaxusidarolelafekok.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/58403494731.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/7deb49a90909de98d56d472514323083/dimosatapekajovopek.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d32084a6d---tunej.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a731538805f---16447837639.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/169401442.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dbec68161b9---71288293710.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/4601906567.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/68370002015.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/84076814145.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/4480b294c6488e62d9b77a057c2fc0ac/xijirojewenunuz.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085205b4d0bb---vimol.pdfIn PDF document text
    • http://www.centralperdana.com/file/14584117988.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f75b9050d3---livakirezuzivexosoromulu.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/kopifiralujo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A2 10752 bytes
SHA-256: 54bb366e3c30b79c05578a086eeef4d49d17c4c00ef5295c8416babb87e4dc85
font_01_sfnt_off0000db4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF361 15660 bytes
SHA-256: 253104fc1884f3b51bec962437abacc6e84d0b4002202e5a6e07d22e5ad9ab8b

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