Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9d5c6227d2b71a…

MALICIOUS

PDF

75.1 KB Created: 2021-09-07 17:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5e8b99d8dd8991789d3a0298e91cb3fb SHA-1: 68b5d4e4162eb28438d68530b7390b873299c78a SHA-256: df9d5c6227d2b71a5d4fa446eec9ea65ef3b799735b728ee95d8a058d5149f34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm or redirector to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate effort to host links on potentially disposable or compromised infrastructure, likely to distribute phishing lures or second-stage malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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=printable+worksheet+for+kindergarten+sight+word PDF link annotation
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/6ca657eddcc2a8529c810ede601a2ff4/76512169417.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/jirofulorised.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608711011a1a5---26520792500.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/vodiwa.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/ef863f2d58211755a6a8e703fc180664/53026214077.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607298cc322b9---vaduwimejikalufimo.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/nolasomimopok.pdfIn PDF document text
    • http://nhs1966reunion.com/clients/1/1c/1ca8f1639ee69cd7806809ed3bcda9bb/File/lapakitogi.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/76687298345.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/23324360853.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbf084cbcfb---23350374994.pdfIn PDF document text
    • http://bmcsteel.com/uploads/baiviet/files/guxekapuriguxawigataj.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/wokubepatafuvupinuk.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/88083567390.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/68958946365.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/13841807548.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/vijavegofume.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d01d55c8253---devalolatuteneruvava.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/95780014738.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087d16938305---59375236350.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/78214849804.pdfIn PDF document text
    • http://lohs69.com/clients/82366/File/20235143248.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaf3c0ce02---pukawusabeludexe.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/e73dcfc10631dfce75d79cddf070d5d3/36659223171.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/83096361371.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_off0000bfd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD4 10952 bytes
SHA-256: 2d6e7015235e17ab686f410b30e39a96c25738e5f94ead467959fa591d670943
font_01_sfnt_off0000d8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FC 18004 bytes
SHA-256: b47fe0b3ee8fb085ac2b4a78b8ff2ab8db29cf6895cc737645bc5d00eed48f2d
font_02_sfnt_off0001061d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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