Malicious PDF — malware analysis report

Static analysis result for SHA-256 79376a721b7e55b7…

MALICIOUS

PDF

75.5 KB Created: 2021-09-06 08:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fc0ffdec4e64d2ae69407fcc87532891 SHA-1: c34c60bfd549aaa2db0ffa6e284d52bb618c20ce SHA-256: 79376a721b7e55b78d4d796d96a46f48d688540b8f303c07fb66317a257bed3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to manipulate search engine results or distribute phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/5a82ea1de3afc60e6e802adf32369477/kulitemoxe.pdf In PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/11457749415.pdfIn PDF document text
    • http://carolstoecker.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/bukiziteduludesino.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/lifulivovadisunivor.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/81143605476.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/fujizobisajeraboguxugivuk.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a933de3f09---56108118801.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087855475517---96546212130.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161078714abe37---wefitopovapadetafawoje.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/vuzewu.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/sefogegoguxodesabaj.pdfIn PDF document text
    • http://co-mit.com/uploads/files/pitakepujum.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/jifatutikej.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/c5175dd31d327383fbfe3bae2e8ed5ff/47426807927.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/b9a0abbe3d1c9df0e197f0a17cc57a7e/vaxidalezad.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/1800528992.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/gotugepa.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/gosakarukusigotul.pdfIn PDF document text
    • http://vasamo.org/pds/userfiles/files/2868421858.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/73938751866.pdfIn PDF document text
    • http://propellerclubsandiego.org/uploads/files/kovojikogadotisipux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=kinobody+ggp+pdfPDF 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_off0000c599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC599 17364 bytes
SHA-256: 36654b6bef07e772ca57f7a7a9d1e36812380cd0550c129c6bc99d799deeb0d3
font_01_sfnt_off0000f259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF259 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A70 10212 bytes
SHA-256: 895ff31f6d71f028b4b4a206c19c29d11fc5c9771eb023b20bdd6ce04d81e115