Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a726fee82656799…

MALICIOUS

PDF

81.3 KB Created: 2021-09-06 18:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3b39e45293cc188921a85342b3efb22e SHA-1: e554f52889223ee14afaf7a230b4634d90dc5fac SHA-256: 3a726fee826567992611d4f33e8cf01c520590a1c25060681adaebedfbc2f827
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely contains a social engineering prompt to install a browser extension or update. While no scripts were explicitly extracted, the presence of numerous external URLs, some pointing to compromised CMS uploads and disposable hosting, suggests a phishing or malware distribution attempt. The document's structure and embedded URLs are consistent with a phishing campaign aiming to trick users into downloading further malicious content or providing credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://sbkf.org/files/files/dewolofudopowopijezeze.pdf In PDF document text
    • https://vieiras.pt/imagensprodutos/file/zulibatizu.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/94679014762.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/82jmnlut9h31vv8l9si4sbhqld/72319011272.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/8dtkde1eucjf0bqlcc9ikp69g1/47329127674.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/45690260999.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210809_585FFF5D4ABBC511.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/91666335408.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/33872461528.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/30952026225.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/932a25207a93759e1af914ef434e17c6/29259334737.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ab6f6cd17---89284034141.pdfIn PDF document text
    • http://waterreducer.cn/d/files/sifusa.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/54486277724.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/93291247196.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/22709735412.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ea9b82210---28780417219.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/98500545224.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed929137d0---66795316342.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/67201228232.pdfIn PDF document text
    • http://altinay-law.com/images/file/ralumiwisupapemefa.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/39770fb7a9a0ba299350d77379d595b0/9889539597.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/nefunufegevarurese.pdfIn PDF document text
    • http://m4krichmond.org/clients/3/3b/3bf4c986be49c21931b3574e72fd8103/File/lovejo.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609e09fd623dd---nexuvimukunorus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=ib+biology+pearson+textbook+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_off0000da27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF239 16988 bytes
SHA-256: 71ae8ca8ae9d9856a480404a9e1284190b7670ba43affd8f1b23e116ffb54985
font_02_sfnt_off00011ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDC 11072 bytes
SHA-256: d3fcc5a4323da229dabc73445f13c8b7eea78a09e5c9b4e8befb9b219a90cd1e

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