Malicious PDF — malware analysis report

Static analysis result for SHA-256 17a9c10803d4bed3…

MALICIOUS

PDF

70.7 KB Created: 2021-09-10 22:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7423f0aad68ce6790bc0bc38609e80aa SHA-1: e4bf39107613e8fddc324a2f20f1afe06a747123 SHA-256: 17a9c10803d4bed3d9212d58ad0731a948ebbe7a3bd80b8b91c1253bfea6177e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm with numerous URLs pointing to disposable hosting, a common tactic for distributing malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wodepcb.cn/uploadfiles/files/83657712535.pdf In PDF document text
    • http://zhouzhuank.com/v15/Upload/file/202199181666118.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/41445628506.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/melezeneparedorebop.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/78044051816.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/77849577066.pdfIn PDF document text
    • https://kopari.hu/files/file/8875039920.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/87863711384.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/10042610657.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/pudogavufiporatizifofefed.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/78728112041.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/ada37a4e3e234e780739f2b2ebb1c79a/vuwirijozixuwewikexetejuw.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/jatozemepulakuziwosenalaj.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/nijazi.pdfIn PDF document text
    • http://steinemann-ag.ru/22045583822.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/66680d4779bf95bf1bf9d710c64cf750/bawoget.pdfIn PDF document text
    • http://salt17.com/userfiles/files/lisefavegokejutugupidojam.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///luzovapoveligudiwivax.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/79238377501.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16131c2db40976---xibuvolole.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///saxorenab.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210902120552.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/mafinagefupofax.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613530ebee196---vagagedirisegitojovas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=outlander+book+1+pdf+freePDF 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_off0000b354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB354 10640 bytes
SHA-256: 957a9cc3aea833c82d2c3f28fd0fe06af209e7a0a23b9b2369e4d609291e8da5
font_01_sfnt_off0000cba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BB 15708 bytes
SHA-256: 7bebabd7f6a4d2f0c9d235085b4b8d7c427ae7a60e8f7071627e4f55177b7f4d

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