Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b5f73c4a4b2074…

MALICIOUS

PDF

69.9 KB Created: 2021-09-27 05:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b6744b4c1e94ab02d89a90f626236f50 SHA-1: e9add2c2b3bfae0e98521392679a5042a2fde87f SHA-256: 50b5f73c4a4b20748a797a9f90b0cfd5535531249e95a3e195300fa4a120ea1e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's used to distribute malicious content or phish users. The embedded URLs are the primary indicators of compromise, likely leading to further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://synerhu.ru/uplcv?utm_term=extramovies+wonder+woman+dual+audio+720p+download+free
    • http://denkobarbell.com/_upload/files/xalulesegixajefe.pdf
    • http://www.saletime.gr/admin/fckfiles/file/nibugiba.pdf
    • http://portalpr-b2b.es/img/user//file/_0968428001631875525.pdf
    • http://888spirits.com/userfiles/file/tilomikumabuwe.pdf
    • http://orthodoxvaidikasanghom.org/userfiles/file/87801448341.pdf
    • https://duproject.com/uploadEditor/files/wewufabo.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161416fcf1174c---wanuze.pdf
    • https://eyetracking.pl/userfiles/file/wasodow.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16137555cb04ce---97247415565.pdf
    • http://auburn-properties.com/userfiles/files/67021223771.pdf
    • http://ski-experience-japan.com/images/blog/file/bowavitefuzolos.pdf
    • http://smartpaintingplus.com/userfiles/files/kevum.pdf
    • http://moristas.com/userfiles/files/66927451919.pdf
    • http://csaladiegyteruautok.hu/userfiles/files/98268521683.pdf
    • http://jan-fotografie.nl/upload/files/tokugorikitaguzaxik.pdf
    • http://giasuminhtam.com/Images_upload/files/suwobuw.pdf
    • http://visit-pune.com/userfiles/file/62314501258.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/d227c0e6697bd8d2b0df687957fa7787/18236219192.pdf
    • http://timebymtm.com/upload/files/sakexikemolibo.pdf
    • http://giprozdraw.ru/ckfinder/userfiles/files/4742854131.pdf
    • https://albizy.com/ckfinder/userfiles/files/mowanedopovumu.pdf
    • https://salwangurugram.com/files/99362023049.pdf
    • https://triptoboloyfoundation.org/editorsfiles/files/23309086919.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_off0000af02.bin
a7af0d2e4e2046c6f368d65581b243c3fde9e8475b3dbf10ab1efde0c944acb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF02 11288 bytes
font_01_sfnt_off0000c9a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A8 16792 bytes
font_02_sfnt_off0000e1ba.bin
8303a8f18227a40f33748a387b72a0cbb0812de17e4981d1c7ec575fb3be4ecc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BA 15272 bytes

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