Malicious PDF — malware analysis report

Static analysis result for SHA-256 49647d65a26dfdce…

MALICIOUS

PDF

72.8 KB Created: 2021-06-25 16:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1cde6c71e692d362c5eb80aec9d2877b SHA-1: 52464adff54b8c1c02412f04cdc4afa9c7fd3c4a SHA-256: 49647d65a26dfdce5a5f1a66e5ff6d2e04cfeacf47accbae2d86a9c559e4e3b5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of link farms or hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristic firings and URL analysis suggest the primary function is to redirect users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://medvor.ru/uplcv?utm_term=125+mm+converted+to+inches
    • http://cwesp.biz/upload/file/togijakuvi.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/o8u7p2uj56vuvt2gu7iveb88l2/togumabenojezifizetebi.pdf
    • http://jiehuist.com/userfiles/files/sulilofutebit.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/b0a6a15ea1bc1062ae9d4ec479e2dac8/gaboloxibamalidumakalupu.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/227tjh4ia6jjvc6122qaht9a11/tafekapevag.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/ruto6eoc0sbj2r00dse3rj0qet/95872175108.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/694483f12116ef78e617ee96658f9b85/81386105040.pdf
    • http://aggengr.com/uploads/CMS/file/12610735756.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/45ef6dc774da9d40a605317e04bbf06d/46953061896.pdf
    • https://widepolymers.com/userfiles/file/64688820859.pdf
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fajumulotexegafegoni.pdf
    • https://cottingham-group.com/cufiles/files/44414221126.pdf
    • https://ludifrance.fr/userfiles/file/vokufen.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6213542301---17657072317.pdf
    • 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_off0000bd65.bin
641e2cecc041f064218b7afdcee68d37f9cd0c7d176249f7d3fc14717d2158fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD65 10700 bytes
font_01_sfnt_off0000d5da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DA 16792 bytes
font_02_sfnt_off0000edec.bin
df89d11de769efdb71062807682e5bcc6bb1ef5be544ac698d1e4a14dcd7e2de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEC 15816 bytes

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