Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8dfdba2d6da657…

MALICIOUS

PDF

69.3 KB Created: 2021-09-13 23:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d90b2450574ce343bc30854a0be98048 SHA-1: fad0d447bb86959d4925720d09589da3af894ca9 SHA-256: 8a8dfdba2d6da65761255ec47a0d43bffcfb84d759ae89e291a3c278ece66264
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a single image and minimal text, typical of a screenshot designed to trick users into clicking embedded links. The numerous embedded URLs, many pointing to compromised CMS upload directories, suggest an attempt to redirect users to malicious content or download further payloads. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://cafepiolho.com/uploads/assets/69066795178.pdf In PDF document text
    • https://honghow.com/ckfinder/userfiles/files/54620556096.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/50846165779.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/45525200393.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/gopavikasexukeriwojabor.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/99199708326.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/64473319366.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f70361e69e---1192159887.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16133f45f32fd4---tuzubonobepovod.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/veronuguzesonawejotojin.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/pelokabobo.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/nozafowamenezunadurasa.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/votugogedifaxeludi.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/77341485495.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/26342030168.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/judubabubasobapan.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/64959054772.pdfIn PDF document text
    • https://trieurodata.ro/images/file/minew.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/nonavisa.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/63116184029.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/dodexodisapoge.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/51412444387.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/32634951.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/809fff04f44631995699bbc926258d72/48756902063.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=call+of+duty+warfare+2+torrentPDF 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_off0000b40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB40E 10540 bytes
SHA-256: c4d87aac117018cb3649f0e0749904402c70819ca5250b41e986888875a17c95
font_01_sfnt_off0000cc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47A 14164 bytes
SHA-256: ff2ab20e29853c34e846265eb6ab1b8ea1d2824b2f73f8af397ae92a8ce73979

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