Malicious PDF — malware analysis report

Static analysis result for SHA-256 e34520d6986a895c…

MALICIOUS

PDF

79.0 KB Created: 2021-09-23 21:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 61cdd0d61bab5fcf5a9ccd2ea30a3206 SHA-1: ba4bb3e8b1d10de92eaa829386ca2b2a4aaba33c SHA-256: e34520d6986a895ca041a1114568ceb59f27aeb7fb133aa6d8e4832e6f592101
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://cructi.ru/uplcv?utm_term=tv+vlc+android PDF link annotation
    • http://incomingmakedonia.com/files/files/mogosogafepejumupukuxazon.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109230220062224.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16132c20ead549---sibameta.pdfIn PDF document text
    • https://www.patisserie-flechais.fr/ckfinder/userfiles/files/700181258.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210918191445_0yv13j.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/758f03dc21de29426e32257053a11102/xejusatox.pdfIn PDF document text
    • http://aztkgbv.love-mrt.com/upload/files/53095566983.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/vuzisoborewelizalela.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161448a9cab1a2---xumodujajuko.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/tirotalalazinar.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/40207656209.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/59827414210.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/36581852073.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/98992223829.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/87750339810.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/revokapekegaxini.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/fetodojud.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/94968409294.pdfIn PDF document text
    • https://anfauglir.com/images/file/92953695191.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/92442607450.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/57747430521.pdfIn PDF document text
    • https://lederstuhl-shop.de/ckfinder/userfiles/files/56512277840.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/81701695063.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/57513016403.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/porebagunobajokekokusi.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_off0000d362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD362 17400 bytes
SHA-256: 7efcb42db15c730f9e33d4553ef23fddc5f1ab11e77a0615295931d7d8054683
font_01_sfnt_off00010079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10079 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001188f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188F 9996 bytes
SHA-256: f53798d51bad8dfa069253e0d7ecf9b95436e72fd9e31f1208313336ebf2b710