Malicious PDF — malware analysis report

Static analysis result for SHA-256 5da6b448001d050c…

MALICIOUS

PDF

83.1 KB Created: 2021-07-03 08:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 79118f6a54c7bb4a15f66e790a07268b SHA-1: 35c966de84975101b4d7f7b168421be07967e285 SHA-256: 5da6b448001d050c8b86160d95598139728cf1304ee2c8d306cb9956749b097b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The presence of external URIs and link farm characteristics suggests the document is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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=baby+shark+song+download+mp3+free PDF link annotation
    • http://brilsports.ro/userfiles/file///beseretar.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/fitanogoni.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/d1d88986a090461ba37c3c25f1fbbceb/xubiwurebekanulekowe.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/fekolorevujeto.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/nemesigimo.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/0965fa7a7798c0ef09ce91ff1b3b7215/18725022830.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/35734413158.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160774eb61ebe2---25332589651.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/diloruv.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/vuxiremikutemotones.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/cc5e76ebff591fce913b1ee9442c5b80/64971719180.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/g2ketk8nn829qebht3dl8trnf3/nupodawumasaf.pdfIn PDF document text
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/72368891784.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/64209781813.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083d6fd1f699---73588011441.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/0f7565251eab3ab9c418388fe33de1ae/noxemomesipuzazamo.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607860f33c1b9---86507058643.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/b125f7c28efec5d8fb8b9185d3bdb382/xipatodomevilivuj.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/7ae6933f9a2e1b2f443f37b7df14f037/82111997902.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/83890d2968c84255c7361f6388306310/robaligu.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/50425545213.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/2294693efc1572f9292d0164b1726602/lipukugubinetu.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_off0000dd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4A 11412 bytes
SHA-256: a28b0be04f525a8bfd4e0070e000638b988b63a802af9480f5afc31a60e3c41c
font_01_sfnt_off0000f7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C5 17956 bytes
SHA-256: b60996e28e916eaa851019809fa5cc915ae933dafad18105fe083668868d3dac
font_02_sfnt_off00012720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12720 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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