Malicious PDF — malware analysis report

Static analysis result for SHA-256 200e8cc4b46526d9…

MALICIOUS

PDF

88.3 KB Created: 2021-06-28 00:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2b5fe6f554e78958e68004258706bdb SHA-1: c816c5767a83030adc629b5eea64d258fe4ce8f0 SHA-256: 200e8cc4b46526d9f8a92886d14f13dad317a384df6206c37f0fe6d3d2c85f6e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous URLs hosted on compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malware. No scripts were extracted, but the PDF structure and URL patterns suggest it exploits PDF vulnerabilities or relies on user interaction to navigate to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://medvor.ru/uplcv?utm_term=self+employed+home+office+expenses
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ad3a70d95---faribefojob.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/9s8the10rfrnc9djveesh73ml1/zanotazulipep.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bb063035c---56111789722.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff81926853---nubozema.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/3p8gtun3mgoohkgnbncrkb1ii6/zofupuwu.pdf
    • http://yilip.net/userData/board/file/20430000350.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da4efd8b71---daruzakagite.pdf
    • https://karinbentum.nl/uploads/file/31300731956.pdf
    • https://daaeportrett.no/upload/file/saxananafexuxides.pdf
    • http://micronforgacsolo.hu/UserFiles/file/tinamajiwar.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/0b1759da6fb3f947c5250f38d80f712e/90015809667.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836ddc79ed3---tofinorawijinan.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160cc4cb5644f8---muwezizesepilurixekan.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/ca91a75aaa8570da77bf937d584b67fb/37198374989.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9310dc9a8---ranezetufutafofudox.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/3eiovvug6kpkhohk1nduablqi0/zasotibimekolob.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927f1c973ea---12321339001.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/psvv7c1su3v4s59p809heh2pep/sunokilusabakizuje.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160863bc54cfb9---6798884971.pdf
    • http://peaceinsrilanka.lk/userfiles/file/kaguzifi.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160742ce845ed4---91074594644.pdf
    • https://cihangirhotel.com/upload/ckfinder/files/jogikodi.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e4ac0793e18efb476db7e74b595e3b05/48725425301.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160787c0a67e2e---novukititaniwidono.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4e8.bin
c8be0ccb868da63aa1c0cddfaf7fb2ab7ff2c5e9d0354d42670c7fe93428f518		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E8 10816 bytes
font_01_sfnt_off00010d9f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9F 16792 bytes
font_02_sfnt_off000125b1.bin
2d2f8643570e1f2b0d7a61252ab675976f7939a9c9031523f3647fc3ae75e42e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125B1 17564 bytes

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