Malicious PDF — malware analysis report

Static analysis result for SHA-256 f869ec7ccd8b8acb…

MALICIOUS

PDF

84.9 KB Created: 2021-08-21 06:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ab34f4babeba744d67fdeb9543815bd SHA-1: ecaa8bd50c29b3dea29de40831fddec3f38efe76 SHA-256: f869ec7ccd8b8acb59b0fd668a5b3c63af3fc89abade9da5e98821d35b9c6bf2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs that point to compromised WordPress uploads and disposable hosting, likely serving as a phishing or malware distribution lure. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://inwebjor.ru/uplcv?utm_term=descargar+neo+geo+para+android+con+todos+los+juegos
    • https://cytairtool.com/test/userfiles/file/20210703_a1f6a.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/kp6qgct8289v0r88bpvvah6ijr/xamamodaxizajiwase.pdf
    • http://gagutp.com/sa_upload/userfiles/file/20210628012927.pdf
    • http://wojno-stal.pl/pliki/file/21524067080.pdf
    • https://gastriklandsbf.se/UserFiles/files/63287983614.pdf
    • https://hockeymro.ca/docs/file/48405486330.pdf
    • http://odontotecnicacoop.it/userfiles/file/14148799277.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/7c6586e55791930ca154f10960f267de/42129129896.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c34fdab42---51422746297.pdf
    • http://dui-antidote.com/images/userfiles/file/fijopuneduvej.pdf
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/8bb612b45238f1a339964aa4ec8b1642/resulimufisiseramar.pdf
    • https://pensiuneavalentina.ro/app/webroot/file/fixumafefamedubunulage.pdf
    • http://hotelclinton.it/userfiles/files/vulorasuwirelu.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62276a2a15---folifun.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096c40148b1d---62909661358.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d499a362e---83502298016.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/1a4e168a890432699f089b208d03b9ca/19373893560.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f996e8d804---6671051761.pdf
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/kuzirixedet.pdf
    • http://assessmentinsight.com/ckfinder/userfiles/files/21020388739.pdf
    • http://www.ctnphrae.com/ckfinder/userfiles/files/4775038268.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_off0000e220.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE220 16792 bytes
font_01_sfnt_off0000fa32.bin
6be2ef49fe86e8fa9408540af5de37bcb548f92c988876a6d09f3bef4b957be3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA32 18532 bytes
font_02_sfnt_off000129da.bin
8b791672013ff92bcd93d6aa332b46dda4a07e7b4b620d929b8c32554ab98444
pdf-font-stream PDF embedded font (sfnt) at offset 0x129DA 10920 bytes