Malicious PDF — malware analysis report

Static analysis result for SHA-256 051f5cb62d625388…

MALICIOUS

PDF

76.0 KB Created: 2021-09-19 18:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 845d144a49f4a07de76bb9dbb6a9733c SHA-1: af63a1a21fb8a6cf14dba3d5987b01714229a03f SHA-256: 051f5cb62d62538856d17e987ba9720cf5b7432e6d6a4fdb9f9bcf7c799092d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. The heuristics indicate the document functions as a link farm, directing users to various compromised or disposable hosting sites. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' firing strongly suggest an intent to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=cccam+on+android+tv
    • http://w-f-l.de/user_img/file/xamakofax.pdf
    • https://oazapiekna.com/zdjecia/fck/file/tixijejigobijimupulip.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613846455448f---sefuw.pdf
    • https://blogsma.com/files/budajinuguropupijos.pdf
    • http://fiorenzuolatrack.it/userfiles/files/remixifegakusesugiwuze.pdf
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/zugepetoluledegitok.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5e886f03d---91796674698.pdf
    • http://imreelectric.sk/uploads/file/besezazezaminazi.pdf
    • http://e-junghan.com/userData/board/file/nigisexijexinusul.pdf
    • http://holzbau-napetschnig.at/20977570421.pdf
    • https://perfecthospital.net/FCKeditor/file/8312007954.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613d112326782---1555827565.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d02f24175---xuworidufinezexinuge.pdf
    • http://aallergy.netlovestories.com/upload/files/wofapeloturowelel.pdf
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/vixexon.pdf
    • http://flightshop.jp/images/blog/file/98390460297.pdf
    • http://nanumed.ro/uploads/files/62790843257.pdf
    • https://www.domosystem.gr/ckfinder/userfiles/files/99804608401.pdf
    • http://arablift.net/userfiles/file/leserexi.pdf
    • http://goldenmallbiotech.com/upload/files/99208847091.pdf
    • http://laulumaja.fi/ckfinder/userfiles/files/85771904562.pdf
    • https://www.confirmedtour.com/files/37991026200.pdf
    • http://timavoshipsupply.it/userfiles/file/pakozatuwawokadivopevuxuv.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614247482a6f1---9078649807.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_off0000bffb.bin
0e4966675271deb9dcd928693b210b6ddf45c14c89a3e2881ba7f8d48162f269
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFB 19844 bytes
font_01_sfnt_off0000f342.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF342 16792 bytes
font_02_sfnt_off00010b59.bin
8d897940c368840a484e9cd8643e348480158fcd2ece7b70f7e79df3665331a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B59 10280 bytes