Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b0f182bedba134…

MALICIOUS

PDF

94.5 KB Created: 2021-08-08 09:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: da2c0e0c47e08fcc564fc72b1405856e SHA-1: f5186c76880aba34be4eb532c152040da71fac45 SHA-256: 40b0f182bedba13421a0a03f800c0e9b75631b3975c61fafce7b92b58805be39
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal that the document functions as a link farm, directing users to multiple compromised or disposable hosting domains. These links likely serve as a lure for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c42f4b2d3f---58673533354.pdf In PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/28f1edcc26010926ec280e56ac501504/65269443600.pdfIn PDF document text
    • http://banquat.com/userfiles/files/vinosaleleposurelufe.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/jevepudopitugonotumox.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c43644c7c6---bipodevekoxo.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/86810504757.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/pomamavar.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609febd7128bb---39877583591.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/90339348882.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/70320544535.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/nopozomarilakaviv.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1609468d629b2a---37327697710.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e66828c57---balegeviwukaxozanuvaxiz.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/vepiraroxunowosulutuseki.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/934d56d1c7222b5da897d899cf373deb/78667061646.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/fc95aafbc830b5382ec677ea84860236/96956953107.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/39899563305.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/4885757194.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bf067de6d0e---sudarakidufixemuretufi.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/49281837682.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/zirisakitufosaroxoka.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media//61121660992.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/10126108192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+use+cast+screen+to+laptopPDF 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_off000110e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E6 10452 bytes
SHA-256: 2dde5309bcf2e7915417f466a4cc7dabd150aed6b9b464bf737835e69617744f
font_01_sfnt_off000128d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E8 16656 bytes
SHA-256: 9326a750181c05ccfdd17e08dfdb48c414d4b9f9d47382e87d26fd46843296d9

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