Malicious PDF — malware analysis report

Static analysis result for SHA-256 2570aa131303fc07…

MALICIOUS

PDF

73.1 KB Created: 2021-09-17 00:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fbcf816bf1b83ca1977da5686565ec98 SHA-1: a712bbd0e599daf5bb2da44a1b5b0cac61492f4f SHA-256: 2570aa131303fc07e10574b11485f86bbe72a5b29ed7da17412ffd5c81a4066a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The embedded JavaScript may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=%E0%B8%95%E0%B8%B1%E0%B9%89%E0%B8%87+%E0%B8%84%E0%B9%88%E0%B8%B2+3g+true+android PDF link annotation
    • http://explosivedevices.ru/media/file/78414000582.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/volotixepalebe.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/223e1c0387197c52e88bb3d3ec7e5324/gotitasolidisonox.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/35006622384.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/43500166055.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614161f79426e---86063196741.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/17921981651.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/vidugerenuxusapiz.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/98041161834.pdfIn PDF document text
    • https://tigaintan.com/contents/files/sibilufufasatesave.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/96867745401.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/nigege.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/xesuvinuxelivopisus.pdfIn PDF document text
    • https://fond.ru/userfiles/file/mefonusakobesogunowi.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/50144250185.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/93889275055.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/zosupuvuxemamowekekoga.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613920c6ec3e9---garabuwilulokofof.pdfIn PDF document text
    • http://vaynhe.com/upload/files/luneje.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/17764169516.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_off0000bc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC4B 10384 bytes
SHA-256: 09e2d256c8cc32bf1591a19dc3f4ff533a025926cc7b8d9254eb4ea289012080
font_01_sfnt_off0000d3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A3 15948 bytes
SHA-256: b303ca5a45c63d463373c94a081710c5b9e18658608c4845919d6f4aecb1384e
font_02_sfnt_off0000fd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1