Malicious PDF — malware analysis report

Static analysis result for SHA-256 01218b2130c8c3b1…

MALICIOUS

PDF

89.7 KB Created: 2021-06-19 12:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b89c265b87972ac83dae5f4ea06171c SHA-1: 3ccaaf3bb4ab3e4758178f98baf3cfb5e45b0a8f SHA-256: 01218b2130c8c3b1dcfd1439ac42a9810763987a5496f0799089e31c43f0c193
156 Risk Score

Malware Insights

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

The sample is a PDF containing a link farm pointing to multiple compromised WordPress sites, which in turn host other PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URI heuristics and the link farm structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://akkoryazilim.com/userfiles/file/putiwed.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608afba0380af---35134377068.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba32b37a99b---zegezusemozu.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608a99c7a81e3---sugewone.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/bc8206a4f25f5e696cba94a1a32d5759/gofemalopuzu.pdf
    • https://108pizza.pl/uploads/userfiles/files/ripipevoreru.pdf
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/8727918328.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080d5e4cd38b---27923992614.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/d55970ad9a18a7ba3ad6f6439b90fd34/rodunetedugebuwo.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/4f66a576d4c8d0d44540fb5ebdaa2bf9/xutujezavowedemadenivofag.pdf
    • http://prplus4u.com/ckupload/files/31770736992.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/utmqiens8v82mc1jqejf2lfd0h/33661992106.pdf
    • https://burkina-businessschool.com/business_school/uploads/file/4058941436.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/2e3062908a06db0814b25b479ccf9e13/69477518510.pdf
    • http://spadhotel.com/basefile/spadhotelcom/files/fuwitudebozudibob.pdf
    • http://cocoal.com/uploads/file/48804082046.pdf
    • http://nordicaluminium.ru/userfiles/file/73255774032.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=sap+delivery+table
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b9a.bin
c0b24c4b877ad2a2c9707469b1a645d9620d37be210e7428e499f635328085e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9A 5180 bytes
font_01_sfnt_off00011d52.bin
7908338a13b5a62d934f3b920674d7184e6f5b89e3c6e0252fd431ef96d155ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D52 11484 bytes
font_02_sfnt_off0001447a.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1447A 16204 bytes

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