Malicious PDF — malware analysis report

Static analysis result for SHA-256 4942194e0b7145a6…

MALICIOUS

PDF

83.4 KB Created: 2021-09-01 16:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d252f4009f02657c303cb4a3ce0be008 SHA-1: fc09cbb2330078cfe64273d3e1d7a1e9718670dc SHA-256: 4942194e0b7145a6aa1b69384b23e1cd191e1d2c16a12ab5ef72f7d8601cf71d
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document's structure and embedded URLs strongly suggest it's designed to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ezokniga.com/uploads/file/sezefo.pdf In PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/c12e65f8aa8a339a8d4a29f960e0be84/98470795989.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/eb4a8cbc943ee8ee808154c92d05a7d1/vumapazudekewafadaja.pdfIn PDF document text
    • http://umiyawoodworks.com/fckdb/userfiles/file/mipizopusasajisowikagora.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/37372310367.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/92383306480.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/32991777998.pdfIn PDF document text
    • https://grup-rul.ro/printuri-fi/files/jakexokizuwuxobip.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/61223185162.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/lurogoju.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/fasuvizobejesasufak.pdfIn PDF document text
    • http://air-ned.com/uploads/files/37029359649.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210809_12C689DC4380CE4D.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/5c16c79b48dd45023b0eb01396cfe2ea/mawisugumikuwopubumebob.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/12d29e347164b67c25e983af4a718174/42461809144.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/p2t4mebikuvgvvcnvg64tt3nki/zubosegutusa.pdfIn PDF document text
    • http://compsult.net/userfiles/file/vonunefekibesijejus.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/zitowufepamudi.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/75791485907.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/naburasasezerit.pdfIn PDF document text
    • https://pellevah.com/upload/files/63635800100.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d05c38051---98031186481.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/14380472ffd647a00ea54f9b41520195/17208976356.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=gcd+of+zero+and+a+numberPDF 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_off0000e077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE077 17500 bytes
SHA-256: d2e956a03cbffddac6b67a4a98cacb8c38015f2647e9b5ff0c7d8f6ebeb4a3b6
font_01_sfnt_off00010dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBC 10572 bytes
SHA-256: 914b8cf23bc49325501aba057e4fe4ce58371bfc1221df95687468ce09508a8b
font_02_sfnt_off000125e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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