Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b34334b39e35bdb…

MALICIOUS

PDF

87.7 KB Created: 2021-07-13 07:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 24fa938f5a124704fa026ad0924f9f0e SHA-1: 7c984457df72bed76c7f58923e6e4ecfbb75fc74 SHA-256: 8b34334b39e35bdbf293390d9272df873e3bdd70fb368f6b18dcdd12180abafe
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 acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://coretry.ru/uplcv?utm_term=best+video+sound+editing+app+for+android PDF link annotation
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0a57a21b6b---pefibupawirumomakubab.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160817149a6f23---muxaj.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebb6b64bba---30164358244.pdfIn PDF document text
    • http://elesud.it/img_pagine/file/bufurejodotaxunenagu.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/tuwejiwusagibotudupozox.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/12967656417.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/fonewofuverezulogikakako.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bddac7f1275---dufadidusizonuku.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/c39c79ca6eb7d2acec474c7d6963a572/37830931522.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/rilaz.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-6-23/20210623021148947786.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/bivogi.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/kuludaludefomowuk.pdfIn PDF document text
    • http://getem.eu/files/file/58862523788.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/83216186829.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/2ea75ffc74133474a17fb8f2d4953266/vumelasotufedexi.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/falamesunuxadifok.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/886983a51209e96bb029a6897cb307d1/55120985851.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc7de92834---bufevo.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/1901l8lr3qjpgur6fl0g519n71/divijuleri.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094421dc4ada---gomokunidulapabetes.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160978574092dd---jufam.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_off0000f2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B8 10844 bytes
SHA-256: 691ebe987047619a0c04f2b1e38a66ca1b4b8bfed6bf1b4452d18f69b60949d6
font_01_sfnt_off00010bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBE 17516 bytes
SHA-256: a0ef2a280833bb8311a7418cec44dc857081f70fa2998500b33afbbe366e5d3f
font_02_sfnt_off000139a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1