Malicious PDF — malware analysis report

Static analysis result for SHA-256 355da2b20c50db1c…

MALICIOUS

PDF

88.2 KB Created: 2021-06-30 19:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 783107cbc3a1b31de6e766bc397afa35 SHA-1: 7caf328dc25ffd143eec2110ec92bd02fa4c98a7 SHA-256: 355da2b20c50db1c97d38d5c69cf1d83680ba95487c2e0be83bc7e9720eb2036
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious or phishing content. No scripts were extracted, but the presence of numerous links to potentially compromised domains indicates a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/dff2cf38856cf9e45c004ff1a8dac3e1/12577841295.pdf In PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/11366465232.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/2f7c0fec524b310e724e6f83ffba6cc8/gudafisogelemaje.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/96773934911.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/xolodudirip.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/2khofm36pljlconm3ismni81k5/papelipinagixivaresixav.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/3d19189b3d70fa45afe7ce1fd7f24830/kukowirafevukufulibazom.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/2k57ue4g4ltcq17ju0lndttb16/70271680570.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b160b2a221---16392082003.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/desojimuwenu.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607140d852487---volulafi.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/gotumefitigunetojutawufo.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/mefagositefeled.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a441e26040a---93442164495.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/gudevafudi.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/7v3mg2423gem2pqjheu3svem02/7590905878.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/99479648266.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210608235620.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097671d3f5cd---24702782253.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/86645296962.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/24045508022.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/jupopufob.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/80791108319.pdfIn PDF document text
    • http://dzbnf.com/upload/file///73092777318.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160979aee801e0---68916607852.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=brentwood+blueberry+pickingPDF 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_off0000f3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A0 10944 bytes
SHA-256: a4948cad17652dba4bf8b454dafbe1d74f82f5da8fb61b160125d5c1fe0a5c76
font_01_sfnt_off00010cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBA 17144 bytes
SHA-256: c9192137c197be969b0cc7a7c363fb19703d39cbf9e614bd73526106ece97a04
font_02_sfnt_off000139dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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