Malicious PDF — malware analysis report

Static analysis result for SHA-256 80fc5e6c64d7142a…

MALICIOUS

PDF

70.1 KB Created: 2021-09-27 19:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4d7944b481134eaa5b308cd941c34119 SHA-1: 7b4fbbfc9b57bee78e714c4ef6313520f7d2a3ff SHA-256: 80fc5e6c64d7142ab3e785501942b70b998fdcb52ede483c4f979c3d6a1c33b2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and heuristics indicate it functions as a link farm, directing users to potentially compromised websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the document structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://huntic.ru/uplcv?utm_term=world+tv+mod+apk PDF link annotation
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/40972043952.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021920212423248.pdfIn PDF document text
    • http://napiarsaigh.com/images/ruvaxabiredotokolis.pdfIn PDF document text
    • http://rinsacars.com/files/others/85261911371.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/2401826221.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/26368742694.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fee3d72f6---kodarefogugijafu.pdfIn PDF document text
    • http://strandedtattoo.com/file/30302102010.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/binopimineniwegaga.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/gevawedivogifij.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/90423175458.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/fefakewu.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/sidagimorixur.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614e982d7294c---ragiwitajibibiruwekenato.pdfIn PDF document text
    • http://gapp.fr/medias/files/ridebazesid.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tefisoketeliv.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/debobaxujomowusuroduloko.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/fufavidokadabapipigarijen.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/jafetuzevomurulotegi.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/48492227635.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/fa607be9dda22d8cf5555e6b965b929e/jevexoremaxopuvupimomunuk.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_off0000b1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DB 10208 bytes
SHA-256: a4d32b55de90108fb0a59617d431e30d754d90015ff386ac8a920073c4d41fd7
font_01_sfnt_off0000c8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C1 16636 bytes
SHA-256: 8d94a5ae40587e9c44c296ef173fd478256647b7974f26c45916da1e2638451e
font_02_sfnt_off0000f330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF330 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1