Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ed2202011754d6…

MALICIOUS

PDF

86.7 KB Created: 2021-09-18 00:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f64c4183b1682b811551212cc6daff3b SHA-1: 22beb81c1015bdf548d81aaad5e15582ea4cad97 SHA-256: a8ed2202011754d6a0703d7e438a7e9e3c4687db91428b781eb4d8a21fdaa5fa
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 or disposable hosting. Heuristics indicate it functions as a link farm, likely designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://bosch-elektronarzedzia.pl/catalog/file/xuzebasapute.pdf In PDF document text
    • http://paulgraphics.paulsfashion.in/files/fonukon.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba0c375f41---kovanojabuxuzuxo.pdfIn PDF document text
    • https://servicepapik.ro/files/60981898204.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/22931462643.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/4619805745.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131d4831081c---kenifaki.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2b7f5e8df---69217697002.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/jurima.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135599704383---kopiw.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/63290518052.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/72423394093.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/muxojiposeweravom.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/reromoteviwitonuburekuki.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/51991364769.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/31834352438.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/342851882.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/9d1a4d754f79205e6f230addcd26b374/femomopumefi.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/33851855525.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/zusos.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/nafowusidanurat.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/xemaderazinop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=pros+and+cons+of+ios+and+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_off0000ee0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0B 18236 bytes
SHA-256: 33b30a1c0a63717186cfccce4d9e501b06dc19e8276b940e03b37fe30dd031dc
font_01_sfnt_off00011dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC6 10196 bytes
SHA-256: 8b04200aea283fcd79cba5295a633f4f39e6f168201f90d5ecbeff2c50631faa
font_02_sfnt_off000134b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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