Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eba99a2db52fb10…

MALICIOUS

PDF

87.9 KB Created: 2021-08-04 08:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0decbff84a3a973129ec01c1ef2e8539 SHA-1: 31e9d1520eda2a79d8aecd18be827e7597073d76 SHA-256: 8eba99a2db52fb1045c412ee190d5d41458a3c63d7649734959abd0eae554861
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be redirecting users to potentially harmful content, leveraging compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://eiak.org/upload/editor/files/79107622627.pdf In PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/xunirebedodigabobewimuko.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/7fefa639bda3f542eccba9694f6a1a46/39020155222.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/sl3vrvamt0c3rq6d1upoutj7nn/26159935685.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/vefodujunipofuzajaso.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe0e4cf22f---67141817908.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/xuvov.pdfIn PDF document text
    • https://timjanen.se/anvandarbilder/53/files/nonorog.pdfIn PDF document text
    • https://media-get.com/userfiles/files/dutulebivesogeleguxanu.pdfIn PDF document text
    • http://mebco.ru/images/file/tewituvawimukarisadepuvax.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093d2062847b---44778934021.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6dbc2465c---94858841464.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/nevekisi.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/2237717916.pdfIn PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/39445289047.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/60768333052.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/949bdba7a41b4c6c658543b6501e142e/23322388435.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/223638ce3471f15f4320f66309ef822e/bosonexusubifere.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/362ddbbddd6e9ffe76fb955a75508468/xuwupiwaxonabizijoxasej.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/d0416ba92322184c2a83e6a29819a290/41216912433.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/dukasisokapaxugi.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608fee46182b1---13241515102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=frag+pro+shooter+hack+mod+apk+android+1PDF 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_off0000f219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF219 17300 bytes
SHA-256: a08a767222969397559be8ec5629db0d2c4ff67115ad767d79393a8777e150c7
font_01_sfnt_off00011f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8A 11036 bytes
SHA-256: b6380479f3883590bee34e171ba8a3a1809c344741806a2056ec799a4910f770
font_02_sfnt_off000138e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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