Malicious PDF — malware analysis report

Static analysis result for SHA-256 3db0afbede529627…

MALICIOUS

PDF

73.4 KB Created: 2021-07-02 12:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 217bfa2641df48f6cea376a1b50156ad SHA-1: a2015df7612f5c10866c05937084a1df228e8f88 SHA-256: 3db0afbede529627e3f9189fad32f55d831b70e74fe5de956c92b17e6da3eb25
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable domains, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure suggests a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://longarmacademy.net/fckeditor/userfiles/file/koliforabakanu.pdf
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34803468349.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160ba65f034845---92889357609.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160abcadb803da---20012192476.pdf
    • https://akproauto.com/nbloom/fckuploads/file/4239245748.pdf
    • http://phuocthuan.vn/images/pic/file/xesikepiba.pdf
    • http://sun-eko.eu/files/file/50334088407.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/75oc3b4nbnruvg9cjke1godc91/kutezunikanememunuzume.pdf
    • http://akinmedical.com/uploads/file/lisafugezetivesolamasovo.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/5cba71ea15db004768917688d7ef85ad/gobukikewogipafi.pdf
    • http://glamour-nsk.ru/ckfinder/userfiles/files/86383617785.pdf
    • http://simonhoirup.dk/userfiles/file/likupapi.pdf
    • https://vinadesigndanang.vn/uploads/image/files/dojajefexamovejefimigeju.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0136b65731---30691676411.pdf
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/5ac6h1v1g1p3242cdrejn6oudo/povakelagenalatetebav.pdf
    • http://seoulgreeter.com/userData/board/file/82611535843.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/j1lf0skr0p3a7ls7mt6egmj2fs/18976897046.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/kupirekuse.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/2f20cadf794c868d8861e66c2119e8bd/43034832509.pdf
    • http://iberia-ex.com/images/blog//file/pokopali.pdf
    • http://andlupa.com/userfiles/file/walanilol.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/fevikexig.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=4+letter+word+starts+with+u
    • 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://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_off0000be71.bin
09240991f826496315523a0ae589ce40d5728d703dbe049d0a1169cb76b90927
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE71 10408 bytes
font_01_sfnt_off0000d62c.bin
db016c473a37239df9a463ab458a376889629ebdc6724a920bee6b29dac25738
pdf-font-stream PDF embedded font (sfnt) at offset 0xD62C 16360 bytes
font_02_sfnt_off00010095.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10095 16792 bytes