Malicious PDF — malware analysis report

Static analysis result for SHA-256 6737f9ee49a2d127…

MALICIOUS

PDF

82.3 KB Created: 2021-09-19 00:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c4d56662254696f3afe369421f5f70e8 SHA-1: 4400cc536c35a00cb15a5899efab5e14c4cde733 SHA-256: 6737f9ee49a2d127c00679faee630d917e8a55b5af5cb2a20c2ac14e3bda4db7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The presence of a 'link farm' heuristic and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely attempting to trick users into downloading unwanted software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=gta+v5+free+download+apk PDF link annotation
    • http://dautuck.com/uploads/userfiles/file/warurazivarosiroxavo.pdfIn PDF document text
    • http://merwepizza.com/upload/file/mujolejiludozixod.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b72b8c52c2---bifopujazuwu.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/45516611041.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/xofisirivifimariwotu.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/dojelemuzi.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/rekiziwumekim.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/lapudanowipetogu.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/sepisavedezanusopepejoda.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/48840735228.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/davuvujuvilalaviduvug.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/finekelasujal.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf50c404ba---rejugerizufofajivisa.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/gikusozukuruvoxejarokux.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/38830486740.pdfIn PDF document text
    • http://salespate.com/userfiles/file/56564004280.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161389ab409216---66870847149.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/jikegezuseja.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/56518367598.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/dozesekotejolelude.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16138707ab6ef5---tekutunik.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/53895115378.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/202192222859.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/jejukegagabonofexiwulub.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_off0000dd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51F 10648 bytes
SHA-256: e161691e7e0d988af5db1efcac05d993e1adeea1077839394aef44d49b2622ae
font_02_sfnt_off00010dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC5 17632 bytes
SHA-256: 09240874bc9c5c80f38bbd2e28a2c7a989aed5068d774bdb5157ca02563b9685

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