Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b6b122371b520b…

MALICIOUS

PDF

90.5 KB Created: 2021-07-26 16:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 70511b0b7736a0a5c87279d612fc2a03 SHA-1: 4c630ff87a657d808b961f711b469d5a3769f193 SHA-256: 04b6b122371b520bcca2c83ad69a8a97c6e259fa4ada710014f53cd58cbdf44a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting it's used to distribute further malicious content. The presence of numerous unknown URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support its role as a lure for malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mientrungpetrohotel.com/users/files/pizuvufuraxenifuxuvumija.pdf In PDF document text
    • http://chingyi.tw/userfiles/files/fopakagagulovalazobum.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gtg6ebgplv2ra5jj94b6epvcm1/11552758993.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/np3m7083ocl28i4vj0cou8tle2/pamud.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/e34d4efdfe4ace8ee1a320a58f1b0a36/resav.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/37094254066.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/64733748538.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a551a39077---78046503166.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/rolulu.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/58605156540.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/tolevubugek.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7ad0009a6---japofekuk.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdbae49d01b---21590913306.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/gumuxasuxaxefifefugoxomog.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/d1dc595a6c8d1c6c52089b6524469977/sudajujufavusemonofitet.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/xogumavusuxitezumo.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/78775299576.pdfIn PDF document text
    • http://df-2.de/images/daten/file/7415720758.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/tarimofomodorazegife.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f472c97e13---89343581151.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/kawomagixiwudo.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16074ba89d1f56---zadexifodegenikemorolu.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/71232952334.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/6cl7fgm25qev69cnb10ug6bsma/81732478255.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/d58ef3ac6ec4781cbb8b0ef75faf1e29/divobezatide.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/59405841293.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/e3dadf8fc5c9b15115c8856981622ff4/kofokapixuso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=holy+bible+new+king+james+version+pdf+free+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_off0000f9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CD 17532 bytes
SHA-256: fc90ae7f26133324ff6dd19a18b62327c4705121789a7d8991f21f2f79295a6c
font_01_sfnt_off00012815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12815 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001402c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1402C 11364 bytes
SHA-256: 3d113b45b2581b4df51204901061237af85796f7f00b15d6f694905019c4ca53

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