Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a4a804023d01f16…

MALICIOUS

PDF

76.5 KB Created: 2021-09-19 16:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9aa8e694e56c855efce9435c5822c105 SHA-1: 8e4c2b8246085f76fe791850210196dcb8f3d89f SHA-256: 2a4a804023d01f169e5eab393de676d4f47feee22964c553e7dc1e1701301b59
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://irlanc.ru/uplcv?utm_term=klondike+adventures+apk+mod
    • https://ijfbacknumber.com/editor_up/domopasug.pdf
    • https://crownprolaw.com/userfiles/Proj_Name/files/talerepebumasiwisuk.pdf
    • https://basisangka.com/contents/files/zubixojowezigimuguxenaxa.pdf
    • http://mbfeed.vn/upload/files/detike.pdf
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/21258111312.pdf
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/vuwenar.pdf
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/36015218811.pdf
    • http://eau-msu.ru/ckfinder/userfiles/files/vajoxinizavejugavolimoxu.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137db704e0de---dedak.pdf
    • https://cambodiadriverservice.com/userfiles/file/sezofibobidemududonazop.pdf
    • https://pinyardim.com/calisma2/files/uploads/79982804830.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143015aa5578---kukupudefodidek.pdf
    • http://gold-carsales.com/js/upload/files/wukugofarujulipifefi.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/f95dae3bf7bf0a6d2823b83447effdaa/75020687942.pdf
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/kamewukakenevos.pdf
    • http://mudrberanova.cz/userfiles/file/sexuxefukukos.pdf
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/xofopadu.pdf
    • https://marcuspietrek.de/MARCUS/files/file/zamepituvulokane.pdf
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/jifijir.pdf
    • https://megalightgroup.lv/uploads/files/75426017962.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1c6.bin
1746edea2bb8bece629132e2652353b2e8cec2b253ab05fa0a5f695347d6db04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C6 10804 bytes
font_01_sfnt_off0000daa4.bin
b1e93a76e821d357ebb5ab53c37e75014307cf58bdcbbf8f7e901dfc5d1cea6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA4 19156 bytes
font_02_sfnt_off00010c89.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C89 16792 bytes

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