Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c999f29041ae267…

MALICIOUS

PDF

85.0 KB Created: 2021-07-08 08:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 06b62c87790889d79c2cea7288a62229 SHA-1: ebd1f6c5508d996d1c1eab14f44cdf2c7d0623d2 SHA-256: 0c999f29041ae267b744d80ec29a1a09abf687feb52c870ea9068f0ec0041414
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various compromised websites, indicating a link farm designed for malicious redirection. Heuristics and ClamAV detection confirm this PDF is malicious, likely serving as a lure for phishing or malware delivery. The presence of multiple distinct hosts and disposable hosting suggests an effort to evade detection and maintain operational flexibility.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://kaztelcom.kz/ckfinder/userfiles/files/36164290159.pdf In PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/1cbc4c601159b92b6a3c8a5cc9dd1af6/85884915862.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/cmp0ldffidk1e6019tqvrbtl2q/silamofuvon.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/78269218975.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083490eb8267---7797008351.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f5cd908c8---banibo.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/74191600293.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160831efcaf563---dofilenazijasijuniw.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/sojapagomutenofanuwuri.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/73296998495.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/34782696914.pdfIn PDF document text
    • https://hse.tw/upload/file/71672242036.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a384240dc9f---fudunotuvuvifefemex.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/lelufixalafit.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/sawiwufu.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aee664305e5---fezinozejafan.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc248bdd9ed---dibuzudoridigubujexas.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a1a4b8e6a---68588832462.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/97552505865.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/7eab759b6729f2ac88380082254a2908/87466713310.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/22155512357.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/pagakebokazukanuxogizipad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=solve+for+exponent+calculatorPDF 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_off0000e9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C7 17176 bytes
SHA-256: 92f980ea63d73eeb4327d53f6db968ce0eaf36d87957bd260852928b043b86f7
font_01_sfnt_off000116b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECD 10556 bytes
SHA-256: 409e9d025ad0c64816db39bc431ef94a7daf03285e4125d4604eb0d15e151d87

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