Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8fda9e91493188a…

MALICIOUS

PDF

69.9 KB Created: 2021-09-24 17:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 47388f390f811c09fc8ce8407ebfe152 SHA-1: f2525c567ab28fb6d2acae788734d9e621428882 SHA-256: e8fda9e91493188affe8e9530cdf5970146f1681286f587f1e276d34176fc9ed
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF exhibits characteristics of a phishing lure, including being image-heavy with a click-outward action and containing numerous embedded URLs. The presence of multiple links pointing to compromised WordPress uploads and disposable hosting suggests an attempt to distribute malicious content or redirect users to phishing sites. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://philabc.ru/uplcv?utm_term=13500+v+bucks+deathrun+code PDF link annotation
    • http://pol2-simf.ru/userfiles/file/3853415622.pdfIn PDF document text
    • http://prompol.com/media/file/74758634791.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/kunesozime.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/13042244732.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/50752782528.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613225032dc61---mularelusisuwofapano.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/mitila.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/kafen.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/66396232204.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/regegevexupapavavinomiruz.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/5b671efe080d79ad00928cee9070aa3e/43325865451.pdfIn PDF document text
    • https://wonkingchina.com/d/files/75641306165.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/ae9366d02faf9c3baead025d9e12d065/47494606858.pdfIn PDF document text
    • https://wasael.com/userfiles/file/28182007643.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/1390451039.pdfIn PDF document text
    • https://www.canoe.ro/Extras/ckfinder/userfiles/files/64447193116.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145bbf21f33e---nazuxadulonamugifad.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba8746806e---43673262764.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/52553166935.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/jozujewuxedifozabanazi.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210906_8FD8593AD0743A55.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/9210468930.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/podupomebibenufedegidexu.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/96224474864.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/62929676750.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_off0000b3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FC 14224 bytes
SHA-256: 98435766c50b780da53be4983900aee12438266966aa0833e9c6d4e33c853fc3
font_01_sfnt_off0000d783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD783 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9A 11112 bytes
SHA-256: 6405d12bebfa62e47d64ad6e4cb97bf4baaa0a4695f3eab5ec374bab0478a22d