Malicious PDF — malware analysis report

Static analysis result for SHA-256 a199dfbfeda2a7d3…

MALICIOUS

PDF

76.9 KB Created: 2021-09-02 03:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1ed49cd4826ee223b8ff9c15688ff0e3 SHA-1: a39dfe60fa912ca7412c3c423a265388bca4e7d4 SHA-256: a199dfbfeda2a7d359cd0ead2a9e8c8c43913f8d3cb380aabaf9a9a505e52e23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's intended to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://coretry.ru/uplcv?utm_term=differentiation+table+pdf PDF link annotation
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fd29bac3a0d---zipotizoxopamezikusogi.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/47662106838.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/13505865682.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62c31c2d24---rapemovudigumo.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/63077271930.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/292a10473e4163c6ccf5c85709246a81/tateporateboberudiwelere.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5fadd9a050---pogifu.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b74c539ff---zubano.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc37c8efdec---litelubagib.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/pimilolan.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/a155a121b34573f4d0829221961d2cb4/juviteg.pdfIn PDF document text
    • https://fultoys.com/userfiles/99673103539.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/13004828055.pdfIn PDF document text
    • http://premium-h.info/files/files/jevoj.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737a3edab63---xivifininavebumagivago.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/420428419.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/ridinubinisaxetewovarasu.pdfIn PDF document text
    • http://carefirstyoungatheartgala.com/clients/b/bc/bc61c41cf33a111e4089ebab1e34a2ce/File/doxaxufamoxemixe.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/muvevivubizoxe.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/3a186743be52dbfbf527055c293c9b34/vapizemow.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12fd2629fd---55505041289.pdfIn PDF document text
    • https://roarmysecurity.ro/mm/file/lexipipam.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/16156997456.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/13cc3cedc50b09e62d18ee405f34e48e/33885685301.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_off0000cab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB3 17088 bytes
SHA-256: 81c9307ab373f2e5224447dca826530d78c6f1e1b777a280f9704682d4e05157
font_01_sfnt_off0000f602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF602 10464 bytes
SHA-256: c8ae5e05fa3101f3121efb0fa692707c6f0e2328dc22febfd21bffd903758f38
font_02_sfnt_off00010d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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