Malicious PDF — malware analysis report

Static analysis result for SHA-256 63b3bad518e40d1a…

MALICIOUS

PDF

79.3 KB Created: 2021-06-27 11:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d6dfd75edcb3d78e024f8cbce13b2ba4 SHA-1: fdfe0860da9a0805c2bad9c12d3b27b14a763df6 SHA-256: 63b3bad518e40d1ae6da537c05f39c447ac5edd225b61848e7144f7b5569dfd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://findmecakes.com/userfiles/files/banaguzukofezegar.pdf
    • http://wildpflanzen-planung.de/file/85521675474.pdf
    • http://www.look4job.gr/images/_user_na/file/3804446302.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072128b1cd2c---livofarokevuxepopi.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a076f0224b0---89135827304.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765d4a5f413---wurewuxal.pdf
    • http://rainbowcaterers.in/userfiles/file/xedup.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a051d661e0---82616431897.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/359b6b6lrjm9a4in3ct1giq37p/mesifo.pdf
    • http://alliance-ltd.com/userfiles/bisakuvoxura.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/9a3f1b1073efa68a39ecb7bebc9513b5/7626704997.pdf
    • https://przyklejki.pl/userfiles/20295951855.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/ihvpl63q00fv6fj52nm03gbpvs/29735905536.pdf
    • http://immopolignano.lu/images/pogut.pdf
    • http://nissanotogovap.net/uploads/images/files/82449984301.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dgfot8tk5fhvcdauh78cmg6ea3/55059540536.pdf
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/xaxowuvozemirinu.pdf
    • http://loaamtran.vn/files/usersfiles/files/96758021889.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/5a5cf111319db5518ebb560e70a18648/patexapajunuwudagij.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d831bef3be1---69348853338.pdf
    • http://bmsorganica.com/userfiles/file/67599718792.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083b5593dd7e---25724083065.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=20+bus+times
    • 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_off0000d3de.bin
5c19c665e47de819d641f2b15eebe8a691ecf5498af934f25dad1aa7ec1a64f0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DE 10120 bytes
font_01_sfnt_off0000ea96.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA96 16792 bytes
font_02_sfnt_off000102a8.bin
02d1bc59b9271a69182d17249937140176e01da519c84f973f9bc36810c7eea3
pdf-font-stream PDF embedded font (sfnt) at offset 0x102A8 17344 bytes