Malicious PDF — malware analysis report

Static analysis result for SHA-256 a26a07a94294473e…

MALICIOUS

PDF

91.2 KB Created: 2021-08-01 23:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a5997e5bd14e044e58eb3ba788be3df SHA-1: 01d6ac43618bc10360368a9efee968ec2a281825 SHA-256: a26a07a94294473ea8e128d7dadbea2c3dd2d038b2e7285efa846a9caec45c74
196 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing a browser extension or update. While no scripts were directly extracted, the PDF structure and embedded URLs suggest a phishing attempt, likely leading to credential theft or malware installation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://cleanenergy.mn/uploads/files/sorisoporinonixumipuv.pdf
    • http://badaranquehablar.com/userfiles/files/zajelolasururilogoju.pdf
    • http://brenno-tojestto.pl/userfiles/file/7849862632.pdf
    • http://prosquash.by/data/87921583853.pdf
    • http://jevades.com/aircraft/fckimages/file/12694154620.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/bbf20cfb9bcf7d14b69d670e32c906ec/kafowetusikejabusakalin.pdf
    • http://lagunaapartman.hu/images/user/file/7580789017.pdf
    • http://yesilderecine.com/admin/editor_resim/file/zexurixekiretakot.pdf
    • https://guapa2.com/admin/fck/file/65353284583.pdf
    • http://namuvaldymas.lt/userfiles/file/26969669078.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1be610a59---xovewofenapawegukop.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160814b20aca43---donopukerevi.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/2e1da262d4422de6934d15829ef60b6b/pilikizifikil.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34cfb3e8e5---belepajese.pdf
    • https://ourcampuswindow.com/ckfinder/userfiles/files/lerukulirap.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c8e03007360---21714474235.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/c60337dc5f742501551e69449ba2a8d8/64052359012.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/8nvuch1f0gpuged9lkt83hcfv3/10049538887.pdf
    • https://chezgregoire.fr/userfiles/guxex.pdf
    • http://katyababash.com/images/uploads/file/67004680583.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/3c0e1c9629a13ffb04a7d0227496a6a8/pifumajevijegivorodul.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/jouesvmk91c661lt5ipv8ol7c2/35435409181.pdf
    • http://jmvlpslimited.com/ci/userfiles/files/lopofuzaxafuwe.pdf
    • http://mopron.ru/upload/files/81722754015.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160984814652bc---99264394061.pdf
    • http://rc-modeller.se/images/file///jixizibasokab.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+do+i+flip+my+webcam+horizontally
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D3 16792 bytes
font_01_sfnt_off000100ea.bin
4f45cdda406358b7b99dae2f49f2b019bda23eb7ca0d5714e4e1e57d6813701f
pdf-font-stream PDF embedded font (sfnt) at offset 0x100EA 11108 bytes
font_02_sfnt_off00011a6a.bin
adf8c80b352a3ee60a60cf9710e97bd61ea812ededee3298688e9c6cff5421f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6A 16524 bytes
font_03_sfnt_off00013128.bin
c6675c4ffe3b09aec0c77ae7dd1b7fd7699fcf15725b347a4b6e8a672f78c9df
pdf-font-stream PDF embedded font (sfnt) at offset 0x13128 17492 bytes