Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8cc127c120bcb0d…

MALICIOUS

PDF

71.6 KB Created: 2021-09-06 12:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 41cc841eb8c3234b57d8c3da6cc8c8a0 SHA-1: edae815fdcfbc1fff2c788f3a3a3ce5e49c6cd7e SHA-256: c8cc127c120bcb0dc9a783f7f96e6c36c767800f2155fd476c7739690e45b619
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which host other PDF files. Heuristics indicate this is a link farm on potentially compromised or disposable hosting, designed to obscure the true malicious intent. ClamAV and ML classifiers confirm its malicious nature, specifically flagging it as a phishing trojan. The presence of external URIs and the overall structure suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/55a1e93a53a4c17c274b360667d0af2b/gabadamojib.pdf In PDF document text
    • https://martabaktelor.com/contents/files/94050447386.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/kobalo.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/sumejiwukidatuwi.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16084063d10378---xupijasarivejuzujuwu.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/janasadox.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609737e41d653---45594595197.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/679be0915230f0494620e25dc5b1868b/sokazelemobaruxoleropuwab.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/065e06cef666487be492fd78caaf41d4/77877737020.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/11800317784.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/fegiredolisilosok.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/losolagimutoravufavu.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb12d58833d---kovilet.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/05d1db6446a91a4b606fb0f6c6e0da98/nudebubakuwamutenobalim.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/laxasaxerofurirokiz.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/6cc7dd823dd6250554d84fc24ad5cab4/18024384251.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/4lb2os5brv8uuboagahevuid78/51865652139.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7612924931.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/79077387250.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/73560775807.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/jokobilolaxetuxa.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/83039546952.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=up+police+question+paper+2018+pdf+downloadPDF 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_off0000b28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB28B 16688 bytes
SHA-256: 0a2ba39cab8c3dab731b8bbaa42174f9d9435d971f9d7a774f8fed0e62f60522
font_01_sfnt_off0000ddd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F0 11452 bytes
SHA-256: e36d97771b95911229583c99ce1cc4b6f365c9d9bc8416bd12a86196cd628c84

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