Malicious PDF — malware analysis report

Static analysis result for SHA-256 6808295c20c504a8…

MALICIOUS

PDF

80.6 KB Created: 2021-09-21 17:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f9cb6ad7bd89f7baca9f9c8e5b3fbb9a SHA-1: 9b9681d1edf7e91c9df89195b5a4738c28732816 SHA-256: 6808295c20c504a890bc9b6d38e51c62a6c5ae91808c345b3809e984dba5d884
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. The PDF's structure and the presence of multiple external links strongly suggest it's used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://nomylo.ru/uplcv?utm_term=how+do+i+remove+emergency+call+from+my+lock+screen PDF link annotation
    • http://swaptoys.org/ckeditor/uploads/files/venururiwagibidog.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/70604038421.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/26495384468.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/tebotakiwozuzukaw.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/6ce0cb4c123b6b36deb0ebe828bca662/wixawigureguxog.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/22065712342.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/71481728663.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/rawulowaluvafoxafirasimeb.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/81856747180.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/dibumuxagerirobexuni.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/zariwixekuva.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/78562889295.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/96992095723.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-18/images/files/94962272534.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6df4f4138---momuzizelaxonaveropemazad.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/sewem.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a85664f8b2---63251859850.pdfIn PDF document text
    • https://mots.alaxarxa.cat/cmsimple/images/file/jisetaxivalesadoxoj.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/pigum.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/mikokeparorar.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/33926182292.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/27746515331.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/69994637158.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161310ec6a57ae---waduvuvedat.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/tuzunipokusagive.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_off0000d602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD602 17296 bytes
SHA-256: 9ad7e6c72f073f81c82077551e1c20a7886f670c9c9f38d686d0af8779a72d45
font_01_sfnt_off0001031a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031A 11072 bytes
SHA-256: 52849f5db5995093a58950846033655d8b256ab04eb3f16fe0c0a1b62b9d8a06
font_02_sfnt_off00011cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1