Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d4e32d314fc7d5…

MALICIOUS

PDF

79.7 KB Created: 2021-07-13 11:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 426773b0fd2ef96a7eea8ac42ad46039 SHA-1: eed046bd1b2356a7ea0dabd714d485c8c23947a3 SHA-256: 99d4e32d314fc7d54f5dcf49a5287c3156e5eee105c5af5fc9e1b7b4aecf5c12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that function as a link farm, directing users to external sites. Several of these URLs point to compromised WordPress installations, suggesting an attempt to leverage these sites for malicious redirection or hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://infrive.ru/uplcv?utm_term=90+usd+to+inr PDF link annotation
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb8ae6c87e---40228941853.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/tovolufemoz.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072019242637---44016955360.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec406dcf23---47612203241.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/1a6fef740db7c3309405b6b9ba08494f/74258232903.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/senoxavanalupomesi.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b48991775---mudigigadekusijopep.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/bjspbu14s8vje5c4uv02n6j54q/mulijuwaremusad.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/3215ea1c96aa079bef4bae7f826f6d8f/18696037146.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/20a3ns8ct3vpsm11jecumfo2i1/83581496932.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/79737850464.pdfIn PDF document text
    • https://scalper.ir/data/files/file/kovemedokiketafo.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/851a885b41d64c5b8dac1d3a54569a96/91850401752.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/lowatanedememele.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160baf5f5a3e1e---bunodifomo.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/51567247053.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16080120347af0---64179787005.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/omjnentuq9rtp7tu0e8r3hp8np/18889952354.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/8b7ec976d5bc77ed2470b397ed4eb92d/wuzezif.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/4b991b9ceb594549868ee950894b9433/feguzimevuvalu.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/pq465h55neqcah72ntgmkeuo4s/49265947270.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608685b4af660---40000580472.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/5e3405118107ea94b034ca5c5d6d8f07/wefat.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_off0000d4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD3 16988 bytes
SHA-256: 9f22f7892d10c0ca6d8d70fd7ab224010041f488243cdf854d73cd7d1314e480
font_02_sfnt_off00011982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11982 10196 bytes
SHA-256: 19a57b7442212eaea238bcc826e0321eed8e55fbdb8a3f9b93adcce149a80ca5

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