Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85711be7f5b0f8d…

MALICIOUS

PDF

83.7 KB Created: 2021-09-16 06:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 02d1a90e105356e24c4fbeb7e84039d5 SHA-1: dccfdc1b2d6f6a568596e7db4361b302d897bc0c SHA-256: a85711be7f5b0f8d244c60fb96acfda5b3846c94d9c8737939846e0a1517d567
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 CMS upload storage or are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a common malicious PDF distribution method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://krisoc.ru/uplcv?utm_term=gta+3+10th+anniversary+apk+download PDF link annotation
    • http://ed-web.cz/userfilesfile/nibugexilozej.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16142b35a7a653---keparalaxe.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/serezizevux.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/regilisiduraxa.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/21198651758.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/98289289714.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/20323469271.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/zigedogaz.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612f43d6b3337---68759660421.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/61447459289.pdfIn PDF document text
    • http://dongbanja.com/userData/ebizro_board/file/17298888390.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/56723925347.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/mozibopimoludireve.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/23092902148.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/jevavituz.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/nuxezupobafinonen.pdfIn PDF document text
    • https://tebra.si/userfiles/file/jugorumiju.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/39b48ce90680fd246e31921e72715028/siwusesixon.pdfIn PDF document text
    • https://2winit.com/Files/files/58701726780.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/nafop.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/vinobi.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/80338510963.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142b2e517f08---zasabav.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/novogejaferuzuzemujufogu.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/3035a474472dd81412c151562d9897f2/diwebuwejidaxazewapixeriz.pdfIn PDF document text
    • 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_off0000dd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF548 18672 bytes
SHA-256: 73653f23085b4281841d2fc33ed5ca25f8e8896eee10d9e78c080510dc05f8fe
font_02_sfnt_off000126d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D0 11232 bytes
SHA-256: 5236c0396119c487deafeb1a0792bda6fb21da4a3b54dd722e6eee805982e24e

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