Malicious PDF — malware analysis report

Static analysis result for SHA-256 d404fd83a627c679…

MALICIOUS

PDF

84.0 KB Created: 2021-09-11 23:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4d33b3e96bdba38676f3b390360c9683 SHA-1: 29aabb0a1e26a33c449093b142c7ca8a074cd92f SHA-256: d404fd83a627c6794c578dd31eae1225384e388fbc03752cc7191717b0e646b6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of JavaScript indicates an attempt to execute code within the PDF viewer, likely to facilitate further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/95368570529.pdf In PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecd0120d45---25726296736.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/5125468185.pdfIn PDF document text
    • http://foodchemsino.com/d/files/pasugidudov.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/b5a9adb4377a27f86391d7f7102f7b1f/976788160.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161335d2ed6b1a---kegitevanozusagaxujozofa.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/fixarevekizagevupoxa.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/sajeziv.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/kiwefezebu.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/6566449019.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/vuxoroxofemexulunagebizi.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/51476451431.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/27362221978.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/13545334078.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/32482408002.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/57907261524.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/julivabesenoxutu.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/58264284528.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/e60e6d050506a395b3bf58701f520694.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613952ba086d6---xilamijej.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/kovofosusutabiraroragosap.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16309924279515.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/gesejad.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/jowebunufunepavanolu.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/zutukonajonevanado.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/53885564459.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=horror+games+for+androidPDF link annotation
    • 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_off0000e729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE729 10544 bytes
SHA-256: 735da4082b8ae38e7f4b47924227ff2a405de679ceb6c039170ca54bfc3c01f3
font_01_sfnt_off0000feee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11700 16732 bytes
SHA-256: d7d0f3ef2491eb9c4911845e236e3bb4f83e9aba95bb2a4883698c94aa9caf04

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