Malicious PDF — malware analysis report

Static analysis result for SHA-256 3644002ecfff4075…

MALICIOUS

PDF

147.6 KB Created: 2021-07-18 19:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9b843b1d092e23266d4a0aa0225dbb0b SHA-1: 18272122ea9a1febe359f74d72275dc60a0cf39e SHA-256: 3644002ecfff407561fa98b50223e7d772e757ce79c135af8116ad4c04f3457c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the classification of this file as malicious, likely used in a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/4r0mtgq52dvb5bk6jp0shr47d6/sokibotowuvive.pdf In PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/f69524051ee5ff6845a77e17ca844bea/24440901518.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/di83ctf8obeh35d1igaeaqlb7v/kivuxisuzepow.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dd91ec969---wupodajojizezarufasez.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3847edd7e---dulosaxuratopufojenibamik.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/1580594390.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b776c9ae4cc---72985264955.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/zapivamoridenilodoxisefe.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/caa23261767be70afb87b692abcd41c9/kamixibegilabesugiwa.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/71749969098.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/eef878da329a5807262e199c10211bfa/36962938837.pdfIn PDF document text
    • http://cl-pub.com/files/files/40863854943.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/porixojejiz.pdfIn PDF document text
    • http://phunhai.net/upload/files/45491933607.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/ganisopusu.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc53978832---sedemudigo.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/68c1f4aac191397b8454b97271aaf3ce/kekusagexufik.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0749dd512---sesenuvavi.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/kivejetupob.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16098527ea5731---22854244571.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/dagojoga.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/22910583356.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0a8cd32cab---58430819671.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=hupa+indian+reservationPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/25ca4a5c84ec6a3d45b8c68302cebe2c/77508814496.pdfIn PDF document text
    • 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_off0001e1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E1C9 17928 bytes
SHA-256: 33842b0e3a12be10e98413bb8f3ffa940149071070ea98e9013f9ded272b8536
font_01_sfnt_off000210f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x210F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002290d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2290D 10496 bytes
SHA-256: 4b81ef7e828c1ef6ef5552ba1a554558c874cf5f5054f66ac465abaaa304eaf6

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