Malicious PDF — malware analysis report

Static analysis result for SHA-256 0febeb20661a5f7f…

MALICIOUS

PDF

88.4 KB Created: 2021-08-26 10:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8fd34f55cd33c281c55e9cb1a75c81b9 SHA-1: 845667bb0a03691ef49a47718341c4d6865797d6 SHA-256: 0febeb20661a5f7fe80526b19b98a42fa640749d423032ca1cdafdbaf1b7b1e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm on disposable hosting and compromised CMS uploads, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the nature of the URLs and the detection suggest it's intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/46551696110.pdf In PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982bab411c8---72418844181.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/0aba94358f130f681fc7bb53d2e332e1/direfokobu.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/wikokafuzowibibejutemu.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/c89dedf9dbcdd7d9661a914ebabe63aa/vizexulezur.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bba02d8b29e---94721179868.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/71684629534.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7f8576219---desonegeko.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/530e3ebc3461ad38dd7b3a0d5b030e9e/farib.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/942e66b962695ff3668d16f90b2bcff4/16207254642.pdfIn PDF document text
    • http://yejida.com/userfiles/file/97793374077.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/mijevozazewexazosuga.pdfIn PDF document text
    • https://maria-galland.ru/files/file/6002938739.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/35eef5bf23839d80c16381ef4c87fee6/taralikejufave.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bd095dd12---mexudo.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/jimomogup.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/85022424220.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160845b25490b2---97115255914.pdfIn PDF document text
    • http://hermangroupcorp.com/clients/3/38/389628ddbd62db2fa1e4299ecdfc1861/File/bosijevikuniwof.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa9453733a---gezovobukalebenejofavi.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/bugita.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/bbf8c70b4cae4f382ef4e3ecdd23f385/zopuzu.pdfIn PDF document text
    • http://www.christianhouseshare.com.au/ckfinder/userfiles/files/xamagenejegiwuzewune.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/57674577153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+is+a+prokaryotic+different+from+a+eukaryotic+cellPDF 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_off0000f3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C8 17036 bytes
SHA-256: 5272a4420d2ab4ec96440a5198052dc24b0c53b29cc8b46523fa9a3bf91f3d89
font_01_sfnt_off0001208f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A6 11164 bytes
SHA-256: e18f1a1b15a9b7a761103530a252a812d192223a9379b6aaf815d53fc81a45c1

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