Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c081e8852150897…

MALICIOUS

PDF

72.6 KB Created: 2021-09-22 22:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e65d2ce3685451f0e5cb69a089937ca8 SHA-1: 92690c132a4eda5bc65d47010e2825029c66d0e4 SHA-256: 8c081e885215089734b163ed02403139e134b32eeb0b5c48baa0b8c40212a56c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614057c932a09---jiropikawa.pdf In PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412e515c300---9055870526.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/jujoxudajorud.pdfIn PDF document text
    • http://all-premium.com/user_file/files/rifopibukabi.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c89fb15189---90019247298.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/22212653246.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136dbb2912f8.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/225ce5f935472e9c492c14efacd90a11/lixoteranemoramim.pdfIn PDF document text
    • http://citranco.com/users/files/tevumudapapekazamurefomuz.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/buzuzavi.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/11281061376.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/nedazowumibum.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210910005542.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/lajedesotidemenumilalag.pdfIn PDF document text
    • http://midospa.com/upload/files/vabusov.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/166054632.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/f39fcf66c5815b82465726a1e97ed03c/lalesojujijimuvepabojumug.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/22718947740.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fec6825f97---64477551332.pdfIn PDF document text
    • http://zamgph.com/uploads/file/040853452894.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/balusilinemuzotodajodil.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/rerinoxalatumukewasefuv.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8dce5eefd---mamuzajamepizep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=messenger+lite+betaPDF link annotation
    • 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_off0000b94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB94C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15E 17404 bytes
SHA-256: 9fdbf9decace37a7d2894cad09cc39673c648db59b3c90bb4c7b71556981e021
font_02_sfnt_off0000fd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4F 10296 bytes
SHA-256: ca91ff5b2b809f2ec11a6fa6512e302307d6a7a2eb77c233b319c91ca77f221d

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