Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac1686c4fd15314f…

MALICIOUS

PDF

71.5 KB Created: 2021-09-11 21:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 87a066bb96af6e21a9221e495ffe5c8c SHA-1: 0b6893e84b59435a822706d3c41713c57c6b4247 SHA-256: ac1686c4fd15314f4978c5fe3314a2b4e2b30da4115ffd7fd1adfd641046b5d0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to manipulate search results or host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://motoren-adachi.com/js/upload/files/sebinodotorevowovavom.pdf In PDF document text
    • http://kxxbs.com/uploadfiles/file/a/komajodupezixotex.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64510081482.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/bedenan.pdfIn PDF document text
    • https://trystsalonri.com/images/file/mofesutufe.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/9604366175.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/53924757794.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/45548969960.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/75979701991.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613630251e088---megefezatekil.pdfIn PDF document text
    • https://digireg.si/upload/24530280842.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613841f0c39e4---19185145103.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139de4d18194---61782219277.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/pevogikerip.pdfIn PDF document text
    • http://www.pvvc.cz/files/79456789078.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/496030554.pdfIn PDF document text
    • https://stormester.no/files/file/91166891248.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/vomuganugidelutexamirasi.pdfIn PDF document text
    • http://medi-sen.com/files/files/5897282246.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/78001493540.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210902014631.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/95368170892.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/21170089354.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/naberitirexadi.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/95537149492.pdfIn PDF document text
    • http://quetthe.com/upload/files/tedokejarifevasaf.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/71789266025.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=android+6+frpPDF 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_off0000ba3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA3C 15632 bytes
SHA-256: d3e5d1701a27efdca27de104e53fecfcb15f94f3e5ebd391dd3b7f313f6c0f9a
font_01_sfnt_off0000e1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E0 10032 bytes
SHA-256: c7fcc2ddf09df1e2849c774abd2596170813367a1eb93f567b061a21f14fc37d
font_02_sfnt_off0000f82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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