Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbeb10550e3616f2…

MALICIOUS

PDF

74.8 KB Created: 2021-06-22 19:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: baeda053e0d9b6740f0e946f5c763231 SHA-1: b8c941ac501dc6f35f98c7bfd0f5d5e42d206643 SHA-256: cbeb10550e3616f26013f27ae4bb7a7509d57833b7d7cc888fc6a39e53e9f073
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS upload storage or appear to be part of a link farm on disposable hosting. The presence of embedded JavaScript, though not fully detailed here, suggests it is used to facilitate redirection or further malicious actions. The primary goal appears to be directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/cbaf3f37d0761c7e5d7bc97711454a98/48314910401.pdf
    • https://efficimm.fr/userfiles/files/lugezigikituzadone.pdf
    • http://urparitet.ru/admin/ckfinder/userfiles/files/16959088907.pdf
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/7kajn7gnf1a5vlesng4umu2hmq/51906985895.pdf
    • http://brownewingfamily.com/clients/a/a4/a4d7a48ed280e719b438ae57db99af5e/File/kolazijunimerudif.pdf
    • http://lapenya.cat/imgjovesnaves/file/98504965316.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fedb32e4d---gitoz.pdf
    • http://unseenadventure.com/userfiles/file/8495181695.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/8bec88b94babebffcee9951c56c64128/xagamamefixanuzunenonogul.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/a4r2e3o57hn6kfhd5u2tpjbrvr/kexoxiridamozete.pdf
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/61178907306.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/kb1tlg3d3jastps2l2tuqmq0f5/jagulojusunujida.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/f41ru4h412j6d80c6dscd1ebvd/kazabad.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/2c75d6ef3e79b9d2a85f710151262290/xisexumipedix.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee67f7fb0e---zidakojidogenonexa.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfb579ef69---25644075154.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=world+best+background+editing+app
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e894.bin
59a3ff8dab1bc66977f12f77491f4968e259016cc709c14e8d7d39bc354835bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE894 5460 bytes
font_01_sfnt_off0000fb3b.bin
81a3ea362b40f5bc9c489e2abcae95870ad2d7eb9935ba01cf03b90c7c5efb0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3B 10420 bytes

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