Malicious PDF — malware analysis report

Static analysis result for SHA-256 02a89fe16b42796d…

MALICIOUS

PDF

86.6 KB Created: 2021-09-16 14:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5bf20c0df2e5fc3780ad70de9e3ceb93 SHA-1: e8d6bbe0aed841a385f3d178b06f1f997e2fb935 SHA-256: 02a89fe16b42796db99e2271946eca359310f1136b354c3abf588f53a470b68a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://inwebjor.ru/uplcv?utm_term=cara+transfer+file+android+ke+pc+dengan+usb
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/vulonine.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135038eb7b86---puzapo.pdf
    • http://mcap.cz/images/uploadedimages/file/53177494203.pdf
    • http://schturman.ru/files/files/7281335823.pdf
    • http://anquocrealty.com/uploads/image/files/xesonupaxolikufakikebuze.pdf
    • https://ietc-oman.saktoon.com/userfiles/files/xedixokowinozidizizavore.pdf
    • https://intrigantka.ru/images/userfiles/file/80108340288.pdf
    • http://bearings-home.com/userfiles/file/negewuranul.pdf
    • https://avistravel.ro/userfiles/file/nuxeseluzunifemumadi.pdf
    • http://wakabaeducation.com/userfiles/file/rekutebi.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/6f85969dd2e4de24dbcf74ac4e6dccf4/27689455342.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405092433ba---48504351851.pdf
    • http://szentimresiklos.hu/upload/file/wagunuxixofubejojotarak.pdf
    • https://zoorichi.com/temp/fckeditor/file/namidevisubukixulo.pdf
    • https://nangluongvada.com/uploads/files/34874570382.pdf
    • http://hosteleriayvending.com/ckfinder/userfiles/files/dodikemotep.pdf
    • https://bititechnika.com/uploads/file/20813115963.pdf
    • http://headrepublic.pl/images/files/7657208803.pdf
    • https://phu-komplex.pl/pliki/file/25641938814.pdf
    • https://birotex.rs/images/files/vewumiwixafapeluzupapum.pdf
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/91162379592.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_off0000ee53.bin
264a2d8fe525877033bd562144b50828e931efc44f09e1b5ce1940afcb5d11c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE53 17152 bytes
font_01_sfnt_off00011add.bin
a7bc9fedafba558e3db4958efe053dce288c83e23304bb3e62b9dfac7a6849d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADD 11160 bytes
font_02_sfnt_off000134a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134A8 16792 bytes

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