Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6a057df94b02e55…

MALICIOUS

PDF

90.4 KB Created: 2021-08-12 11:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3fdb32802074c526db13045b99a998bb SHA-1: e289bdb92aa15119b94a27731a68bb39dc73c1a1 SHA-256: e6a057df94b02e554bfa2e230a96dc806523131b50b0dc1faec3a409d7817611
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded JavaScript stream and the presence of numerous external URIs, many pointing to PDF files on compromised CMS uploads, suggest this document is part of a link farm or phishing campaign. The primary goal appears to be redirecting users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://huntic.ru/uplcv?utm_term=how+to+create+temporary+filter+in+google+sheets PDF link annotation
    • http://bielwod.com/userfiles/file/xigezawumunotibefen.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/zinumamuzukugobedimone.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/2d432d3475a7c49d2a764366f59b06a2/kametimaruvibakogopom.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/94637342696.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/nofoladuwomikapulidukiv.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/de7118a545dc788568a3c23429b60441/2663265533.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/laxotukija.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/nafidanizewudebe.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/4aed352e16edf1151b18fa97e082f9ba/xomubumapegozozugev.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/rofomagenorunijebi.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/vuzufafivo.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16082d050d3971---92212368615.pdfIn PDF document text
    • http://hnspkjx.com/d/files/15907200779.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ad27a1c40---navuwedonod.pdfIn PDF document text
    • http://gphs84.com/clients/866382/File/zapebikupeb.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9291aa754---11618980877.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/nemegulo.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/59785260824.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/wuxav.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021051222325270554.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/8rgru8qaemeulpphq2n5d66kf5/26981815446.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/20037538260a3031e6b6c0.pdfIn PDF document text
    • https://auto826.com/uploads/files/surewinevepoxukelo.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160866b148e3ff---81824075543.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_off0000f9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E9 18072 bytes
SHA-256: 264000d429e2d343a9f4c961b7137a0f736708e8d344d65ed16b70457491ec26
font_01_sfnt_off000129db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DB 11120 bytes
SHA-256: 2032440be08dc2abc04e3d9b34c71616eed2855b49e4b1fa57b3bba8311cc715
font_02_sfnt_off000143a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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