Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a996d9d3c31518…

MALICIOUS

PDF

90.1 KB Created: 2021-08-08 07:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fa473551d9fc140c6b57d7ba99983483 SHA-1: e1e187b63e9869ddf3c040a4a173320a3c1a3aff SHA-256: a6a996d9d3c3151846df3aec55bea4ac37b6799a92875b13a54051a97228e1e4
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous URLs, including those with UTM parameters, suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=solutions+et+concentration+massique+seconde+controle PDF link annotation
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ed068b3d2---tozazagalusefasubogokeva.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/mulobefegexigixuduz.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/55lm0pq2h1qhsfgan97vm7b0uc/85292953650.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dc3199dc1---63686273834.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aecafb41238---24185365365.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/pabusilariz.pdfIn PDF document text
    • http://proxima-design.cz/files/file/newomomapevov.pdfIn PDF document text
    • https://panama4d.com/contents//files/39286138012.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/4q6ltgcqe5ff9rlaef8putleil/58541545765.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c3dca3671---vazovufibexidujurajosub.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/silodiloreneziri.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/ebb3e4b207c449dba9dc362da2bc4589/ruzinezelunadojixosixudaw.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/86615527920.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/35434375667.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/luluzumuvubotunonobatido.pdfIn PDF document text
    • https://rajaunited.com/contents//files/gikubajubep.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607434ce01601---15225291745.pdfIn PDF document text
    • http://kingnature.ru/files/files/26369262432.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/rarrqf6rdvhu6jjv85dagd227m/40499390835.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/nadujunikuk.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce0f0dd204---34383793825.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/zisovagima.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/30014934848.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_off0000f8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DC 10852 bytes
SHA-256: 20ef65d5f5a608f35ea99046378e355b83f917cb95e5dfffccffdca3222e5b9c
font_01_sfnt_off000111a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A3 18368 bytes
SHA-256: 1493b0c2707b8d57259cba71133ca027d7e4c8872fca096d3b84b31ee0163fd0
font_02_sfnt_off00013f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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