Malicious PDF — malware analysis report

Static analysis result for SHA-256 963d35fc9ea9a71b…

MALICIOUS

PDF

82.5 KB Created: 2021-09-09 13:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5089941f1407913caab8d892e397011f SHA-1: 9da6c8567b27859d490d210c2421dd12c4985324 SHA-256: 963d35fc9ea9a71b8be7bc6928d4ea0411188e910aa8711dccd9f6a5110994db
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 or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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=pokemon+spoofing+discord PDF link annotation
    • http://alibabashipping.com/userfiles/file/rujofivopolureg.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161325bb3adfdb---74013229255.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161323c603b414---46499110625.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131cefc69f4e---17635389353.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/ramarurozizot.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/xururinatekovinis.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/37537316519.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/kikejadoritosef.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/23802213485.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161327f45378f3---9385324550.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210905235618514.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/31463149143.pdfIn PDF document text
    • https://samowar.ch/upload/file/dafanudutikodeworoxozes.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/xasadilokalanokikulukosaz.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/70566097057.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/zofogojojomagokogoxa.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/doxizodosumidalikufepi.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137058aac99f---88495718040.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/43859098450.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9644794928.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/36268679084.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/mudeboz.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/wubetesabo.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/dosuzowixovoxaso.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/58006140481.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/aa638f2132907b7321d0dc9195b0e8ce/83815917564.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_off0000dcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DA 10752 bytes
SHA-256: f6662ffe34cbb7b3797dbe61e67e01cf16d48b25ecb2d6e66a4ad6225d42213f
font_02_sfnt_off00010d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D56 18264 bytes
SHA-256: 9d489fa0e11b7792f39ad9636f367097c56be123c37ce22c911823979905f4d4

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