Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bdda1556c3a6bc8…

MALICIOUS

PDF

79.3 KB Created: 2021-09-19 17:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7463091cc2b3f18a531f8318848cb970 SHA-1: 26023653584288429b5231537675f2c4ea2e9827 SHA-256: 4bdda1556c3a6bc8c9ddb70511ee7b5dae3c543da95279ad6786542207f7b199
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. The embedded URLs, such as https://irlanc.ru/uplcv?utm_term=virgin+suicides+pdf, are likely used to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9673

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://irlanc.ru/uplcv?utm_term=virgin+suicides+pdf PDF link annotation
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314c8eec7b7---53236642237.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/6257082509.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210905_141647.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3e13a0c0f---dukirudosutubap.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/pofefidupa.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/59831573233.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/nakamutakuzajek.pdfIn PDF document text
    • http://cx-gl.hu/images/files/38857895277.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16132908c9ee7e---dubijitexabal.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/67030056783.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/xazexigin.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/kemaniwomu.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/wupimojegiluloluk.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/87924418757.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314eaba0097---xojutu.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364cf965e64---70058883014.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161419bad647fb---sotuxujatexurisulur.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/kerob.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///zubipusatovobudezajudob.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/sawisox.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/98165159588.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bawavabuwapem.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/66049d85903a64db44b28c9fc38c012c/69017323052.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/bumejiwudixamexageleri.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/jegatevejelel.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130904732256---37190240518.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/jawubofarataxe.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_off0000d0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BB 10440 bytes
SHA-256: 37e2dbfa8ff17ce046a8f576e85f8b1320391fd58050e0a6ea6a87102a244f03
font_01_sfnt_off0000e845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE845 18280 bytes
SHA-256: ed53558ea555445a1b8af1c43969a9101cb021275ea6f1b353d22b970bfb81ec
font_02_sfnt_off000117bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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