Malicious PDF — malware analysis report

Static analysis result for SHA-256 190d9bd842c1cec3…

MALICIOUS

PDF

84.2 KB Created: 2021-06-25 06:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46278b01690478c94ea52d91fb828f06 SHA-1: b4f27a2956d28381355fdb0d248db4bdb37f1747 SHA-256: 190d9bd842c1cec3927cc3051febcf5f06264969234975c5c62eb2b263b5b653
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated, but the presence of URLs like 'https://laborke.ru/uplcv?utm_term=jbl+es150pbk+manual' indicates a lure to potentially malicious content. No scripts were extracted, but the overall structure points to a link farm designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=jbl+es150pbk+manual
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/b66fb56f273033f46d52c77d035a466a/3524470081.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e98253827f---majamemaxigifovipa.pdf
    • https://lacaune.hu/userfiles/file/8379748819.pdf
    • https://kozhikodedeaf.org/admin/my_files/file/tuzaginoxotakelukageliva.pdf
    • http://anhbanglaw.com/userfiles/file/vaminemeruxota.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/v11i8qo762pi0cg0n0n5dnjfp8/75723811699.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef83188021---34177140680.pdf
    • http://italiangreyhound.pl/img1/userfiles/file/94519047764.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160705ca97ff71---vusujukejiwiruze.pdf
    • https://naucharts.com/ckfinder/userfiles/files/9923266446.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/a6256cf8a09581d1b1660ca7df981f97/tipakifedat.pdf
    • https://novzelandiya.ru/ckfinder/userfiles/files/44551749882.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d7cb49617---41685017728.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/5a25sh6dbgfeb90cvrdrad8ed6/19443509329.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://s292376414.onlinehome.fr/datas/imgmail/file/38710200579.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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fba7.bin
c8851b15e5da569ecd07351ab15faa4d23efc1386d37004841aa52ee1a015e4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA7 5024 bytes
font_01_sfnt_off00010ca1.bin
86493092dd5b5770214a34c34c9422d76656f92e03f9a3e4e3e7d124e4330087		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA1 12280 bytes
font_02_sfnt_off000135d0.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135D0 4324 bytes

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