Malicious PDF — malware analysis report

Static analysis result for SHA-256 c845a13a8f3404d9…

MALICIOUS

PDF

89.9 KB Created: 2021-07-02 01:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: bd71b9725391571ac9d211ea17048815 SHA-1: eedbcf6cb998f10a5b172744de8fb22e985d6a4b SHA-256: c845a13a8f3404d97de4f007b791da402d9e3aeef20038cc18839fb4467b17ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as a phishing trojan and the ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded URLs, even if some are marked benign, supports the overall phishing and redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://uco-kampen.com/media/files/lifelexazefedodi.pdf In PDF document text
    • http://www.gesas.it/media/mailinglist/file/venowevenawagowobomi.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f39d17195b---fusijonivo.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084eb25e543b---30997498288.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/dalulol.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/bq44ifh3rm0m5fmg4n6r23k8kj/ziwuvepiwezorukanajaloku.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/20001214059.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/at6v5v83ndhd63591h7u9cvrq3/jasewovupasagufoxosakux.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/d075b7dc3ec98168b5e1a4726761f02a/bobeleburavakukagupajopas.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/man4htprl6lt50bq9bajel5079/67553486819.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606cb3f5541dd---rorozotejorosajadipasota.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861fd20b086---gebuniwosova.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/47703392247.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608338052dcfb---pesamekoxiwulolenirobe.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/tudarikibevubez.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/f13aaceb4c2369fae7b146602f10341c/jopuxewulut.pdfIn PDF document text
    • http://c-amc.com/upload/files/dulemajujabawifapifatoge.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210524033316.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/cc10fccae9de221935163a46deab5122/26474324130.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d90c353e0---dosiwakewilupusodema.pdfIn PDF document text
    • https://banghenails.com/upload/file/38116988244.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160b166e55f728---fusimunirik.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a41385bb9e8---gelepafibevovowufofirive.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/44100498051.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=software+development+project+proposal+sample+pdfPDF 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_off0000fd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1C 16608 bytes
SHA-256: 808f4b8328acc2b9a07fec80857f5ca2ca9b51f0c81a924908d555ac117af5aa
font_01_sfnt_off00012834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12834 11044 bytes
SHA-256: 1b008601baaa4272a368572359d5cd18430bec6795a5032370277962497b7676
font_02_sfnt_off00014202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14202 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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