Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a66303a24c96582…

MALICIOUS

PDF

72.1 KB Created: 2021-10-03 12:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 15af394a2af0622371286a1824ca5ed2 SHA-1: b4d97c3c267580803519798f30bb613ad72ee283 SHA-256: 8a66303a24c96582787c70146e7f89f605b0ff9bfa2dfc2269e60b95d4dbf616
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The numerous external links, including those pointing to compromised WordPress sites, indicate a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://shunnasato.com/xolasiliduwubemizepan.pdf In PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/e0175ffbde40d53f4bf4458c8d22b367/jefanewurobebodadated.pdfIn PDF document text
    • https://olterus.net/contents/files/60597843550.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/87502418480.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/94440537121.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/tenujenezifigagizono.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/73919217264.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/nexovu.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/wusav.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/dtmmd16au3pa23bec2ljn0rbd7/31721626226.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/58840366230.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/70833533455.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/93193599268.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/dajib.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/vaguliluzazupebumutoguzob.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bab8d4b2ee---51690054588.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/siregujenob.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210930184743.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/99527508670.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/bazitakawuzivaxuf.pdfIn PDF document text
    • https://dm288.com/slicice/file/nubebunodukegebize.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/lovuwedab.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/76483577857.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/guvixamadepesekusarujek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=express+the+quadratic+function+in+standard+formPDF 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_off0000b499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB499 17456 bytes
SHA-256: e019c0b2467de52ad02d6a51b6afc2048f02e589950fb83c7a86da775d05260b
font_01_sfnt_off0000e08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A6 11172 bytes
SHA-256: a2f7059c3121751fea1f2855e36ea96846253073118f50b9882b39ffaa40ee43

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