Malicious PDF — malware analysis report

Static analysis result for SHA-256 5802626ad47df840…

MALICIOUS

PDF

73.5 KB Created: 2021-09-06 01:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 94d8d8d6d2dcaa730d88e43e6ceb508e SHA-1: 2c7b500e4b58c4a882b3f3e59adc7afb6d790350 SHA-256: 5802626ad47df8409aae16c8c05110f491ee4475486e51f52e835f0051855d61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://laborke.ru/uplcv?utm_term=cdc+flu+vaccine+pdf+spanish PDF link annotation
    • https://aterhesseg.com/up_image/file/zotev.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/delemiwe.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/b5de87f2d5bb0a22ed135dcad344f060/10813143138.pdfIn PDF document text
    • http://mcutech.net/files/4983550356.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8be791db8---53294321191.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092715b54508---39433630224.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/d05131b81db8d9f01f807e0e88b3b626/dibadovalupugefad.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ca033d7155a---72625234911.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/puwij.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/bogovatelalesugoginivolo.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f608e5a3d9---pigepavedekizuse.pdfIn PDF document text
    • http://atya.eu/files/file/16106687335.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/63370840234.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/83593614034.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/b16933b0ef2684a7825d4fdc6c1abf37/25639986017.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6672c3f9b1---wobada.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/58717169221.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/160811db82d102---mufipijarekaliwa.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/64386699180.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/sesoziragume.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/3789468721.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/8624326206.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_off0000bd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51A 10596 bytes
SHA-256: 84c82592309e1cc10ea4f0ab3d7a9cd7e65f951e664af5601e7436d5841d8dae
font_02_sfnt_off0000ed34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED34 16968 bytes
SHA-256: 0df325680b2fde7494a6703e4e4e5f0f1295470c103b972ae1ccd535b14de275