Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e4589e50d3b504…

MALICIOUS

PDF

88.0 KB Created: 2021-09-15 15:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bf56ff9e207c33c1960bdd6015572464 SHA-1: 5e58f7fcb76a7e3d4a6456174d3cd6b3914c67b5 SHA-256: b1e4589e50d3b504be8a3898cae4c0dd0993b83710cdd9928b78a2d2cd65c0af
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm pointing to compromised WordPress uploads. The 'Password-protected archive handoff' heuristic suggests the document's purpose is to trick the user into downloading an encrypted archive, likely containing a secondary payload. The embedded URLs are part of this lure, directing users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://smidgel.ru/uplcv?utm_term=100+dots+pattern+lock PDF link annotation
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613599541b6ee---wakavewufijixidazabaruz.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/69263780134.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/lupevopamozaw.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/14328337023.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/pilizefeva.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f71d3dbaa---51553612252.pdfIn PDF document text
    • http://mayjack.com/upload/files/75338491657.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/fisupizerajudojijuvolegew.pdfIn PDF document text
    • http://vodova51-53.cz/files/41069757953.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/majimezafojawebibad.pdfIn PDF document text
    • https://uzsienis.cvzona.lt/resources/img/files/33181625900.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dab1dc0977---pisik.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/nepuzemukurovelimobamojo.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/48827247817.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/80686889301.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/41445798468.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/foguvisukux.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/jalifenagetatokitab.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/48497569905.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/fabar.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/59108436682.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/90243337757.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/7458133195.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_off0000f1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CF 10584 bytes
SHA-256: 62d4f627e1e1835bf5389d9b7a72a3db0e215e06bdfc39f8dd8fd93a6a75fb0e
font_01_sfnt_off00010a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1E 18448 bytes
SHA-256: 1fa4d51f69b8419b6bf584c6978893cdb9516664b7cc0bee0fbe3e697aaf87b0
font_02_sfnt_off00013a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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