Malicious PDF — malware analysis report

Static analysis result for SHA-256 8532131150d9b55a…

MALICIOUS

PDF

81.8 KB Created: 2021-09-21 23:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 74dcdc2e5dd75c0705ea346d6d450613 SHA-1: 73f665b21c53bd89c7b8be7461be3428b4abf6a2 SHA-256: 8532131150d9b55a6045d338a37dbc1af1638b38e224c538ec27aeb894e55827
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of external links, many hosted on compromised CMS upload directories or disposable domains, indicating a link farm designed to redirect users. The presence of embedded JavaScript, flagged by heuristics, suggests potential for further malicious actions like exploiting vulnerabilities or initiating downloads. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=modal+verbs+sentences+in+english PDF link annotation
    • http://devitohomesorlando.com/userfiles/files/92310573665.pdfIn PDF document text
    • http://393citizen.com/upload/files/18167381686.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/16169879471.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/megedawaxikuben.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/5b5a00e3f25fbb9a51ac33030626afe1/47999538363.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613283f238b70---27479712030.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/podurugitup.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/tisade.pdfIn PDF document text
    • https://festacontinua.it/public/file/pozadolivib.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/jepok.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/sajadapigerax.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/35415951260.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf79496e27---sogituwolap.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/zipojujoriwigajogilow.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/mezotegir.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/24298625989.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/boguvunulaje.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/gepudodowasujuwufogulozip.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/zaguwudeguvapar.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/soboresapodaxipufa.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/fovagukenedajotadew.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_off0000d8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10E 10848 bytes
SHA-256: 5f77b2990916acf0ae1ec66a922a2ae692bfc221dcf85a37e59cb42bf329597d
font_02_sfnt_off000109d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D7 18876 bytes
SHA-256: 665e091004f66d59d5b406e30e21889c9f1e727f728bb00674a37095ed09cea7