Malicious PDF — malware analysis report

Static analysis result for SHA-256 a46581d022a17caa…

MALICIOUS

PDF

92.9 KB Created: 2021-06-27 04:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7096bc125dda61c3f9e0795c531f945a SHA-1: 43dbd80628de3573287653b1e7ffe5bd76bc2727 SHA-256: a46581d022a17caa62000369159ca04604691b6d5ce42895b05507c375320f6e
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm used to distribute phishing content or further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it may exploit PDF vulnerabilities or embed malicious JavaScript to facilitate exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://sjalikave.hu/pictures/file/99903244978.pdf In PDF document text
    • https://telewebmarketing.com/FCKeditor/file/jopefenodi.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881d84a287d---79803967587.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/59103580966.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/bijajilubel.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/98c39b99be796c10b2d1cfa5ae3e38b3/4482541343.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/f92vttd5rfaf01u60db9ihakt2/92634149079.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/41570580089.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/76761305778.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/54545791931.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755bab316e1---4397062717.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/6c0a0a9e88e98a2596b596221bcd4dce/vigevevok.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/36899967122.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/5585f8d2d8a89ba1739493077064a644/85568756121.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3034c4e2e---libas.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608a11774bc6e---70879356874.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/16004635433.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c366adfcb92257d77c8d7035515ea1ca/navimegosipurasotes.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f640190e21---tigeka.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/zuxalalafebejaruxezezu.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a276f991780---76260917155.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/3c58c713e5578120cf2547e5d0a0986d/kuxiragabinexesufodejep.pdfIn PDF document text
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/47696429952.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/b0c4f30466c22005c1af6d7dd4ff8ef5/kuvajovutalisakodo.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607505dd91f79---mamivijewanexosijegesafur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=surrogacy+miracles+consultingPDF 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_off00010735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10735 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F47 17616 bytes
SHA-256: 6c336e3883dffed4b156a60e113404f7092d09abc6b0a6b98df94ad7329dba2e
font_02_sfnt_off00014d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D55 10860 bytes
SHA-256: 4f5e64983f2a858bcbaed56acd88828d6304dc3576939ec4b06de631a638e91c