Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c90076bb154b8f…

MALICIOUS

PDF

83.0 KB Created: 2021-07-21 10:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b753239a6aea07c0c56585c3d2aeed68 SHA-1: 6d7b94cb57a2b0e4be4228598acfb0da305c0125 SHA-256: 99c90076bb154b8f69d594a1d48ee26dcd2370cebc15e4dc0a2af52b08f703c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://automotiveenergy.cz/userfiles/file/7475736687.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/19e1f9cec3917ec26131c0eb71ddc65e/firunazuxe.pdf
    • https://adsbudget.net/userfiles/file/koxozov.pdf
    • http://asustainable.com/global/file/vejidatav.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df31bf778e6---fonexapuxorel.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce81ec9f67---73978143022.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc2130f8d2---jamulebiforelizadusosam.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bfdcf356c---33685333038.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/52adaaebf9dad3f79549d603edc55db1/gopagimugazudenowe.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/bea4a93f2810e4026ff5bbcf2d83ea70/782759489.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/kifuruparakaridobedaraxi.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/cdfb61cafb32c8ee5aca637d52545165/31674191947.pdf
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/togitelumopa.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/b7add063c65acc41515e8a4df5db2751/81870835949.pdf
    • http://guides2alpes.fr/uploads/file/sumapu.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d30b4b8b1f---96009133910.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ada1e467f50---84760357283.pdf
    • http://elitakhealing.com/ckfinder/userfiles/files/maxunidazofik.pdf
    • http://vbs.pl/dat//file/legapelipujozezatifesef.pdf
    • http://tikatalog.sk/_files/file/rajereg.pdf
    • https://psychotherapie-coeppicus.ch/userfiles/files/fimipugawowajevemavelo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=vohra+committee+report+on+criminalisation+of+politics+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2c9.bin
ec3e474cb54182a6533bdc9af8d846cee9e212e9e13b74d8c32a3950ed5d0009
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C9 10856 bytes
font_01_sfnt_off0000fbaf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAF 16792 bytes
font_02_sfnt_off000113c1.bin
a1dd24c2590472f867d0329cbff8acf9aa3fc5ff3a42f2e9572b817b067056f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x113C1 16436 bytes