Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2c72335320c5052…

MALICIOUS

PDF

82.9 KB Created: 2021-09-06 16:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9be45587809f06b3f48b002f4cc50252 SHA-1: 8f223e8cd3c61f5807a98956a69450fb1be1cd6e SHA-256: f2c72335320c5052c86cd44ad096f6f47afd4b6c70321ca99b562d2e10cac7b4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or redirection to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to distribute links across various domains, potentially for SEO manipulation or to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sunarfactory.com/userfiles/files/27969267138.pdf In PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/sadujadenukevozotawebam.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/28470490900.pdfIn PDF document text
    • http://hanauhrova.cz/files/navusigulukuw.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/xojuruwefojexajiga.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/tabunu.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/motidow.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8844e2853---11634904109.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/rupovujuzepaxevu.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/e5c77678b23abfed8db4a78a74dd58cc/welajodiratifepinareg.pdfIn PDF document text
    • https://majubesar.org/contents//files/47858759240.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/nododo.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c855d4291e8---48349154768.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/52914495402.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/ruruvisiraraki.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/samulikemusezatevagofegub.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082475d0b2bc---40745108688.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da4cb582a6---wilogefuki.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/petemunafopabupo.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210823162633.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075e42fb1319---garobaxezusamafi.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16097cd16e760c---zofejerosulapuzez.pdfIn PDF document text
    • https://turismoporsantander.com/aym_image/files/fopesuwafedoxodefifebo.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/4fal4lg9ohfcibknc52eeelsu9/71828896627.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=preschool+maths+activities+worksheetsPDF 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_off0000e028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE028 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83F 10636 bytes
SHA-256: 310da44d09bcaca4f8fb69fb17b2db70b6a70428c443fcb8418ae8f888bf2eea
font_02_sfnt_off000110ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AE 17420 bytes
SHA-256: cdb29194d98b4c08aa2416869b4b49f4590f097121ea304011494a7b3ad5bcf5

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