Malicious PDF — malware analysis report

Static analysis result for SHA-256 41685ab673ec0278…

MALICIOUS

PDF

80.7 KB Created: 2021-09-08 05:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f6ed0471302da959d1941587b31f1564 SHA-1: 56d9ded99a0c1f5cb4d50444d56bc0af5249c1b4 SHA-256: 41685ab673ec0278f36b522f160e1cbc40adff7ca1e268ec90840064e7c4e30b
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a ML classifier and ClamAV, as malicious. It employs a social engineering lure to trick users into installing a browser extension or update, a common method for delivering malware or stealing credentials. The document contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm used for distribution.

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 https://sukhayurveda.in/userfiles/file/roxubuw.pdf In PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/e03d9bf9e489a518bf19b5d24e907155/27388423276.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/sikivuxajuzakelexovesa.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/ec925f250aed263a623b7d07a5a224f7/79592462956.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/rigedidusizonajegifonimu.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077154ebf69e---lorosex.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a075d88e335---tizulazabumekodeme.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/92541138641.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/p37rfqg0h9d2j6noh267a87b77/66266528087.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/47719516517.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/2159030741.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/walabifag.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/l3r306sndie4gvvrnvqg2orqph/bazidavodakazomezowo.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/nubugirimaju.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/kafitagelarevisi.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/miseto.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/dezejedexawu.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9eaa06a94---40116484457.pdfIn PDF document text
    • http://forumts.com/ckfinder/userfiles/files/150402226.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f10781fc7---46214903779.pdfIn PDF document text
    • https://ridersshop.it/file/54075277896.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160826718cec9f---zokiwu.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/pinosatutapubejeluveri.pdfIn PDF document text
    • https://www.nitdgp.ac.in/uploads/userfiles/files/ziresada.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=compress+pdf+100kb+onlinePDF 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_off0000d5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C1 18052 bytes
SHA-256: cb3abf39b982acdebdbe0b10cceff76c9ec8694e4f8151c36243d108ec3d60bf
font_01_sfnt_off0001046a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046A 10836 bytes
SHA-256: 9342404852ed2d7b55d4e4e3c584efe72a5c65451b31428acabc301757821dc3
font_02_sfnt_off00011d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.