Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f6946547650454d…

MALICIOUS

PDF

78.9 KB Created: 2021-09-01 03:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9cd534809421251383e6b6e2da2ce48e SHA-1: 28e7a4ea1e8ca61c24b0d2ca1e3b7af5a99c2722 SHA-256: 3f6946547650454dbd97ca4f064ec1da23275baa56b6248e8c4842d51e5ff339
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a phishing or link-farming attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ceramicasvillaflor.cl/UserFiles/File/83602929267.pdf In PDF document text
    • http://dlzj.net/upload/files/20210622195431558391.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/669eec00b8cf473e32bda0795594f5ce/tupekokalimegiwat.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/susexamofix.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/fopajigazobabalofalarase.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/8165066420.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/mididuzagadun.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/14198145815.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/70474593852.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/dimijimobisapuv.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/87411070646.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/rbab7f2l3ebukifdpo8kkqmh60/vabivusuwapisa.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/61267425206.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/rigalovabolofu.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/081b0dd9a21c1a9cb4e3a69926335ca3/84165385781.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/524cbb34b34319fc5e8bff6e96ed86bf/5021139022.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/fovekusijafulomuxedexu.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084996655cb5---dobojimopezuxodumanesi.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/241a3162ba27d17156a2e4386f8369d7/zavoseletudunokajazoxaw.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a35373bc5---tepisewajuzo.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/wadudaginelifubukeji.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ee8109b32---70015215374.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=gdpr+article+44PDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD272 17520 bytes
SHA-256: 0b566016d87ece7c728a4d52f6b591ce6efb8aede9cf4f8126ff9b8e49e6fb90
font_01_sfnt_off0000ff18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF18 10232 bytes
SHA-256: 6538efea3b67f91238fa0bf1880ea5711203923d3b33961b0d0ace1a1e0eb958
font_02_sfnt_off00011634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11634 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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