Malicious PDF — malware analysis report

Static analysis result for SHA-256 579d118e49ad68d0…

MALICIOUS

PDF

96.6 KB Created: 2021-09-19 04:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7a5e5aa83837359a96077ba14816a728 SHA-1: 8ba4838aaa099bf7cd477f6ae12ddc96c7acb287 SHA-256: 579d118e49ad68d0b60ea0dd44ba4bd04ba1df0dfa9ed9aa0c611b96b88210de
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous URLs pointing to compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these sites to host or link to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://acrgruppe.de/userfiles/file/mofaxodifexirogupasuw.pdf In PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/luwolokatalipe.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/jijulen.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/41757416114.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/55791245292.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/68546909302.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/36135469890.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/20738490092.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/14179809054.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/xajevewajixojokaxisazul.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb92c763aa---darigijazax.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/lupapano.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/30360601942.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/843a395b6af7c09c364e00014a04f532/82524273831.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/93246881669.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/kakova.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/19433762033.pdfIn PDF document text
    • http://norilsk.torbay.ru/images/uploads/file/wefavomutifedegop.pdfIn PDF document text
    • http://budka39.ru/files/puxerimujuxesopusuwawelu.pdfIn PDF document text
    • http://www.pvvc.cz/files/gotawonogaborizawagoko.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/tojol.pdfIn PDF document text
    • http://salwex.hu/file/nibeti.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/bejokagopaze.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ad7002e6d---43004814047.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140bf10c9275---92711225574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=compatibility+view+chromePDF 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_off00010ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000122ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CA 21656 bytes
SHA-256: e971f6a917d616663f231eec364f5694b102f0f168f3df51f1c5a5b678f40adf
font_02_sfnt_off00015b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B9A 10804 bytes
SHA-256: d30767683f05acd29e0f1ce26ded97277f2dd5c0401b9adf54b586f66b290849

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