Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e07bebbc27fe7d…

MALICIOUS

PDF

73.0 KB Created: 2021-09-12 08:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ed5632b2fdcb8fe79b83036c6cc9e14 SHA-1: 83c954e7451a260e9c66ed8fee67d5cb43703486 SHA-256: d4e07bebbc27fe7d8e59f37736ac4d3546775cb725bb1fda1ff0dc94cc14265e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No specific family could be identified, but the techniques used are consistent with a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://laborke.ru/uplcv?utm_term=fifty+shades+of+grey+season+2+full+movie
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7e02e97f6---6026956392.pdf
    • http://nhakhoauytinhaiphong.com/upload/files/80695325815.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16139b6c879daf---jikukawupibukimewedigab.pdf
    • http://104408017.linker.tw/files/sezadukasaziruxivodoz.pdf
    • http://isotope3.pm-ural.com/uploads/files/35586468036.pdf
    • http://gsemilia.it/userfiles/files/48014377424.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7f73c64d6---31739477713.pdf
    • https://ratodua.com/contents/files/wekuwuzugidefigurabir.pdf
    • https://benqmusicworkshop.com/fupload/file/nimizagavosi.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/dbcf5416b11ea0cb7a00c9ddc8e40568/lutewovuzajodegad.pdf
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/57435454979.pdf
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/wisuzisegaxaxirabunetita.pdf
    • https://juraganmonyet.com/contents/files/xamevobagupovelazosapub.pdf
    • http://eikenhorstgroep.nl/userfiles/file/lavevowomerasivisareju.pdf
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/dotavesifape.pdf
    • http://nensi.si/upload/file/kenaxokaletikuji.pdf
    • http://lifecare4all.com/upload/files/zomazeguniwom.pdf
    • https://e-motorcycle.tw/upload/emotorcycle/files/minuvavoja.pdf
    • https://bestofbucerias.com/upload/file/siton.pdf
    • http://kubablimel.pl/Image/files/zubenanaxukan.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d64f3283f0---16535456704.pdf
    • http://huntland.hu/upload/file/54264285613.pdf
    • https://b2cdemo.tickets.com/content/files/kipakopunewumure.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_off0000b8ca.bin
0ea9f273572d0ef8b5ab5314ce1381af30def3ae3396c0d8fc94c24322a61fab
pdf-font-stream PDF embedded font (sfnt) at offset 0xB8CA 11176 bytes
font_01_sfnt_off0000d299.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD299 16792 bytes
font_02_sfnt_off0000eaab.bin
ebd5c48f3cfcd387f4adf9fdff21a5840ad03eb2b71684707ac210eb4ffe160c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAB 16896 bytes