Malicious PDF — malware analysis report

Static analysis result for SHA-256 35e2698720903599…

MALICIOUS

PDF

95.0 KB Created: 2021-08-16 21:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4edbce904d5784de53ce6d4f8a35842b SHA-1: d2f73c89d52086e9067cb65834de2db8fcb6798d SHA-256: 35e2698720903599af81cff80596c8aad1a5a35bd5c5593348ef3f16032f1fbf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content or conduct phishing. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca74649528---73842234775.pdf In PDF document text
    • https://foodvellythailand.com/upload/files/mebapuv.pdfIn PDF document text
    • https://diaspoassur.com/wp-content/plugins/super-forms/uploads/php/files/4b73f8421ca56a565a1e815b4460bbf9/nafizarebapebibofalakub.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2106041952417073627fj5ey.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/98802634462.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/0pe5aur64un95gfhdhdlecg3b3/dafepawilipar.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202106file/2021061410511970554.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608680b346683---ravedufiwagegagoxamovu.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/1620957912216.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/mmnbp19k7aom53tdh57o445b56/kezujavupuvixafozuborura.pdfIn PDF document text
    • https://altbuket.ru/files/mugoputovugafafodexeva.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/nomipepefivavujutimijaweb.pdfIn PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/69314310656.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/90506157507.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/e6763a6d78995a7e31da44e3bd92b0e2/22074772548.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609535ffd4d65---18514899719.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/gulevogu.pdfIn PDF document text
    • http://joewhitefamilysite.com/clients/59967/File/74981555067.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/82069079476.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/20937061293.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/pf53i4qm1s96puvemgu86tvu01/dizogalebedopem.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/f4db7dece278d38ff304e88e1f1386f2/wumujeteri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+a+protagonist+and+antagonist+definitionsPDF 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_off00010e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9B 17156 bytes
SHA-256: 1f4206b14d74ab0498320e79a15bc2e6bf9c6f5ee37057493e0a27673229a2cd
font_01_sfnt_off00013b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15341 10724 bytes
SHA-256: 94e8d7e88b30c959f4df559c211c2b35c882bea618f466f7233fa21b43977afc

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