Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a8e49939a1ab0d…

MALICIOUS

PDF

70.1 KB Created: 2021-09-27 08:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d4e07049bd1dfcf8395c9161203c2524 SHA-1: 55116bee6bfcff5594028e25c8be0faa6079e12c SHA-256: 98a8e49939a1ab0da534b1ca0be44c6796c39b845bf9bedf7eba7eaa5bf2592c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://bfr-bialapodlaska.pl/userfiles/file/viterolekigesaxazizew.pdf In PDF document text
    • http://www.siposferenc.hu/html/senugepabodi.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/rotikegob.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/fipumikobepufom.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/39429184416.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/12028626311.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/f446436131c9a73849ee20d5f0f38f02/porudututidudomum.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/fokakafa.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/80596889240.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/werovaseximawaludeterebu.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/magizebe.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/tdsibvt2llg5uceiul331b56o1/gufozeke.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/6087598208.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/88243806427.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/rosimapefibiweju.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/32038307003.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16151354c3a88d---11164657681.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/68052421570.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/15843797224.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/kaputejelukidevow.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/zazofinebotavisasonax.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/3987840836.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/73650481369.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=west+is+west+putlockerPDF link annotation
    • 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_off0000b0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0EA 10372 bytes
SHA-256: b297bc014f97a185c569df568659b15f60c4efabe8b24f75a1474496372ed8da
font_01_sfnt_off0000c895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC895 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A7 16088 bytes
SHA-256: b894c0ac2414d220f3434fb9accc409e73e589fb1c9d737e9a144fa98c84aabe