Malicious PDF — malware analysis report

Static analysis result for SHA-256 3db45d43e2ad7cab…

MALICIOUS

PDF

91.4 KB Created: 2021-06-29 21:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a9f69c7d373090f357f3bbbb7da8b825 SHA-1: da328bfdb46fbcf4f657de61f60f27ac376d7e04 SHA-256: 3db45d43e2ad7cabd548e6a1d29c72c6def080594ef268cf91a53efc482d9f42
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing or malware distribution lure, indicated by multiple heuristics flagging it as a link farm pointing to compromised CMS uploads and disposable hosting. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via the embedded URLs. No scripts were extracted, but the presence of numerous external links suggests the primary attack vector is directing users to malicious content hosted elsewhere.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/u5joehki1d70e5f5mvbi6mlf1e/12231428072.pdf In PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809b3dd2dad---23398185093.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b84289a3c---derexojojivixirubimili.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/c2d7d9e75f313a3da247ed386b3a1fe2/90666680720.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/46448122377.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/220b90858e236ea9c5c85339e6140afa/39215645317.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b694c1f2a3---43726129115.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/zivaligedizekaz.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/5b5e767d963bb16757e1db18e735048f/21329726832.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/06df1763ed05a8eba52fe5a12e131a3a/5349965714.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/63398528822.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/277b6d26efe1643b4be8167e7bfd54e6/puvafoj.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d42ba56d9c---jigexaxepamipudetujuge.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/68324596598.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb8ab347a3---6117757207.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1dcf2cdfd---52124590150.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/e9eigtliqcasbdj8no07o2k234/vedeso.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070a632d5348---muzonuvito.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/tidagisak.pdfIn PDF document text
    • http://desagresbrts.com/clients/34568/File/geparufeladoxabeguzex.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/cb9d09fd55d121f1ac96e8233f2baf4d/87867246371.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/kogumumeripomuzimedanemul.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/warosoluzataxenuxonikufa.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/87126714897.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/e86bsset11ksofgat6pa5cl2r2/nasomegejasozuluwe.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/midog.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160931e3d6d74e---zozexugubi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=gcf+of+30+and+80PDF 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_off00010182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10182 17928 bytes
SHA-256: 1f47a004f74106ea92b08387f49d369042b406ab92b80268e34a86f48df8817d
font_01_sfnt_off00013071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13071 10376 bytes
SHA-256: cb40c86c6700c58c61256d7250e2097babea193cc819e6694e9a7f3365c6be38
font_02_sfnt_off00014809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14809 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1