Malicious PDF — malware analysis report

Static analysis result for SHA-256 a399816be333fdc6…

MALICIOUS

PDF

85.5 KB Created: 2021-06-27 06:35:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 781d62421e6427caf329c9376a9e65d5 SHA-1: 5ccfac7bcb946f13b491003f337a436df5f27361 SHA-256: a399816be333fdc6f3f667a3b89a46d3eee58cf4d91063eb89299d45b7e0159f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The document body is unreadable binary data, suggesting it's not intended for direct user consumption but rather as a vehicle for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nasroglobal.com/userfiles/file/dijumukorami.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a8cd53f4a---jizosomogukufedodemate.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bcb70d5bd---62893168098.pdf
    • https://247christianity.org/fckeditor/userfiles/file/720314212741621102718.pdf
    • http://0851gay.org/userfiles/202106file/2021061800135470554.pdf
    • http://abwingssuffolk1.com/uploads/files/5674782708.pdf
    • https://bookatowncar.com/userfiles/file/mefuzu.pdf
    • https://delphin-restaurant.com/ckfinder/upload/files/25969377643.pdf
    • http://szao-spb.ru/images/news/file/tofabuwigurupodupovu.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/56c1c566c86a4b3f5b76e4e679e00b38/fejaxutudogimovajewe.pdf
    • http://111-orte.de/testarea/cwsCMSlight/media/files/morafa.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b0d6b2cb5---25485261805.pdf
    • http://canoeing.by/pics/files/dovaxurajalufip.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d7d63b367c7---diruxag.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762f6805792---puluzugazixodu.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/2394c52005f9952cc7a4bdd56943bfe6/29683549231.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/10c541027e89c03055023cf96105fa34/49372054735.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/5d0b32ec1a6a913899e9e611ad049f72/38062392000.pdf
    • http://asfalon.com/__files/file/94964206806.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160840ea7a945d---44702836865.pdf
    • http://gopherandsquirrelcontrol.com/admin/images/file/dumoma.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/f8d0f05dd2026a79f048632e16890bcc/21068390199.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d386c223f9---45692521682.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082361ae648e---69820537183.pdf
    • http://alpha-cp.com/userfiles/file/fokokelekodajuro.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=adrenaline+for+anaphylaxis
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9df.bin
cb9b5761377f7a0e7ee82c7562a69dd8ebac9b2f3be053e680039aa3416d09d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DF 17404 bytes
font_01_sfnt_off00011694.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11694 16792 bytes
font_02_sfnt_off00012eab.bin
ef45ce5bd9ce9cc03af43ab8f5fc6036a88d76933cecdb77cd4815ae7b679071
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAB 10692 bytes