Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44dcb61d3172989…

MALICIOUS

PDF

85.6 KB Created: 2021-09-02 12:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 82dbebbe0ac85b582860d6f8cc47a313 SHA-1: 1253ab3a8060ce3bd3e6ab17ce0d20c90588089b SHA-256: a44dcb61d3172989e6cc1f39db67101dbf55570a59ac9a7e07f1b91b2f9608fb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the PDF is part of a link farm, potentially leading to phishing or malware downloads. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://novussiteyonetimi.com/uploads/file/67787028538.pdf In PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/vojod.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/365fba84ee44aae2f7d32a8cd2981dc3/ritojasi.pdfIn PDF document text
    • http://fotobambagiotti.it/userfiles/files/45135524146.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a28ef01d6a3---52956095363.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/22450191662.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/21513589093.pdfIn PDF document text
    • https://grouptm2.com/contents//files/kenuvirijojoxalawuxetama.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21404932350.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/sajofuvilupeguzesomiw.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/duruluje.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/e733f6c7074d0864b9d923d185dafc7c/lanonakonulolilavelaku.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/10957266140.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/dojipulejeti.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/73410083231.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/lutaxutuxit.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/jitojesifusofemize.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/95774726543.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/muziki.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73b53c791b---fozomajojifilegixel.pdfIn PDF document text
    • https://plasy.com/uploads/file/damadezetopozedez.pdfIn PDF document text
    • http://tano-cable.com/d/files/gavebaxowoxojixomuso.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/sosofawizizuzokanolojiti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ethnocentrism+vs+cultural+relativism+pdfPDF 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_off0000e8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F4 17832 bytes
SHA-256: 2bece24a8ed2883a2b0b66c56d44dbf160e0671d9c3cbafb86bd788f0b76a779
font_02_sfnt_off00012f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F16 11036 bytes
SHA-256: 878e15e9ca6b42369c823e9478a192c70025fd11fdc4759ead78d844b105c028

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