Malicious PDF — malware analysis report

Static analysis result for SHA-256 cce70853214be778…

MALICIOUS

PDF

83.6 KB Created: 2021-09-04 01:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f1cf5de0e7cd972870746490bd05efa9 SHA-1: 3816f9ccf131be65731d2d09e17e23f16670382b SHA-256: cce70853214be77879d8d89266d862bb6e43ccdfe82492c3cc5f2cb200d1b217
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and numerous external URIs, many of which point to link farms on potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further payloads. The embedded JavaScript is the primary mechanism for executing malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://garglob.ru/uplcv?utm_term=python+django+tutorial+for+beginners+pdf PDF link annotation
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ncc5u7tuljiguc45epun61o72/95883364881.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f605d3cf4a---manurukibi.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad375bc60e3---puwitegalinokebulovasekaj.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/41851074388.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/bugabedi.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/alp3r0ls7sb3m3rf8d64k20mh3/60468452537.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/majotizifipude.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/soxukavur.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/78555595770.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/bc3762714991662303f2abbe98b1fb3a/80815287979.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/guloromefozub.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021050417350473499.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/golotalafugopepoluva.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/muxadometaxane.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tedutukexarijobobatepo.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/aed3aefa6636b7a3ca984e651b0178a8/dumikuminuzesipim.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/danifiwozar.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/nigugezedetev.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/rinanazukuneverutiritok.pdfIn PDF document text
    • https://ksboutlet.com/file/files/27963833667.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/51908959394.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/8e82badd525bb28e9e3e091cdf40cc82/danelumolagimorojawi.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_off0000dcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAC 19092 bytes
SHA-256: 4f25fefd8d4778821ceaed97b11fd028753499792054055356d3dff82db0e0a2
font_01_sfnt_off00010eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB7 11260 bytes
SHA-256: 44e7e68dce8659a252e21ca71ed542a29df5dfee232b3e52ec8d47b0089b01cb
font_02_sfnt_off0001289d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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