Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b6638c48afc2d4…

MALICIOUS

PDF

75.2 KB Created: 2021-06-28 16:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9f6bd508ebdce96f421aa6801c1fc6c1 SHA-1: 4b5ee167eaa6f861c231a07d62ffe099dbb383d9 SHA-256: f2b6638c48afc2d46f40367d6a2f610c05fb269a18b9cee4a7c53a7e66b5fed2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, pointing to multiple potentially compromised WordPress upload directories. The combination of these factors strongly suggests an intent to deliver a secondary payload or redirect users to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/bd0675b65f803692366f6e80b07317cf/70883756255.pdf In PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160796f05541d9---85269375569.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/0f1a61e5ed834c3d7ba41f3f986fd5d8/74251316116.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a481da5d7d---zuduna.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/58736763336.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/janusozole.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/012b44351dac74d659e2272e9b58286e/lovewuranemizewuzetopoj.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078aa842e78d---75210662555.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/kebikabipovoxejuwexu.pdfIn PDF document text
    • http://grandinspirations.com/clients/75274/File/70492746826.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a43667ed389---32833925032.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c40f2a990---lorejal.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/skaks18ikfv49lo8q5tbi7ij4h/21702340033.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/26352362387.pdfIn PDF document text
    • http://infunplastic.com/d/files/31010530808.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ac185318b4ae0dc1f15405d4b150d214/80317049716.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/6623aa764d795433aa56eec2ef95bd9c/5571774111.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/55482584085.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/mugesuko.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11c9556c7a---24178830172.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b82a64d15ff---77770421257.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33e83833f0---sibulinor.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/79523868017.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/l5o5kgr19l601ksqh20o2jbv15/52412310559.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/c52ff1d374f2ab8df2cda1424457c346/578722777.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/mo6mj99bvii0hoembnh1srhj0o/95256161889.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=birthday+wishes+for+my+husband+in+tamilPDF 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_off0000c274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC274 16652 bytes
SHA-256: 3a6fc11884eeaa78c9f6aae07c8e5ed3fb67ff51f91ca1a7f6c04c7346ae89f7
font_01_sfnt_off0000ed86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED86 11112 bytes
SHA-256: d290234f3a9625def2be14f38756b8060c20ddc83f560084b18bf8d7c8d2d691
font_02_sfnt_off00010754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10754 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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