Malicious PDF — malware analysis report

Static analysis result for SHA-256 40e2113ff7f7fe69…

MALICIOUS

PDF

78.8 KB Created: 2021-07-05 14:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: aff073ea49b573517fb2006584f4a93e SHA-1: d45567c01edd19adf2dce1ba31c316908b881224 SHA-256: 40e2113ff7f7fe69487a02ae3d95573757eeb627f9c6f44ac6fcdd8b71c79389
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to obscure the final malicious destination. The presence of embedded URLs and the overall structure suggest an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=2wire+2700hg+b+manual PDF link annotation
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/2139bb9a4b21ffb69889a3a0c2dc809e/tezidenujeko.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087b70d25664---velove.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/08f5283c96d9f8324719f9c5361fed34/zitabole.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/0lmdr8j0f2m9oc6ru77kobhatm/vowaxemalonatojep.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/g8gifkssvajhc6t9u6r55nptan/49797617100.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/adbdeeac6886949ed2747d4330042bdd/bixaxanoveti.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f52f9aa719---lajuwejonal.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b152cc410ec---82292110129.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/73978553044.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/53268723571.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609829d14721a---46217479873.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/60826593404.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/90297454502.pdfIn PDF document text
    • https://silga.ca/userfiles/file/dupozakevez.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc8567de2a---nuxepomezilup.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/56502957463.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd0e9836cb---timabafawita.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099b3aec565d---79214208178.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/e88973cad814b358524d5687c506ed1d/tutanazamoxofenonalubovu.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/u00ev6vaeajf04jcq7a0fhmtf5/nenof.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/mijusireloxenobedu.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6f022768b---jekilufevafepujubalorado.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210702_25F08CD266DC29B9.pdfIn PDF document text
    • 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_off0000d00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00C 10688 bytes
SHA-256: 10793c6d21458c66644a8c72190253561508664034267c9f6859eb7e9269a4a3
font_01_sfnt_off0000e876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE876 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10088 17024 bytes
SHA-256: a90bce0fee4ac71083e01f135fc83c7b4c95a417d66bf055efde2bd6653f76fa

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