Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99ec579d694a8cd…

MALICIOUS

PDF

81.9 KB Created: 2021-09-07 00:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2165006001956d239439529fc09c2c9a SHA-1: 47486e81e1c6a0150ae95095c9dff1cd708c1e8e SHA-256: d99ec579d694a8cdecf20503d9af7c1e5cbe3a33dab3029b7a54404b83733ca0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file exhibits characteristics of a phishing or malicious redirection campaign. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://fivetc.vn/uploads/files/zokuvawopivabivub.pdf In PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/a9e318b33e5f4278eb4ac873d8c564b5/84661715685.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/wukabajewavurumuwuzimilu.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/v9aj2bl9gn6ijebe7t2vggqafo/gujanumojolowulojeluzagu.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/7c05bdb6420e9d023fb9af899dd113a0/14118464965.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/gebafubabafagazuviwun.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/72042647813.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/22357108414.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/45052124288.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f6cd3ae9d---37532711341.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/doxibidevikalow.pdfIn PDF document text
    • http://zaiger.ru/img/file/99882821555.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/xabububutagovevo.pdfIn PDF document text
    • https://ka-base.no/images_content/file/lowavunavutizugej.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/vepakojunitutag.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/60282239780.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bitim.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/ac11e310b6a067220586802f62fc5d62/kekawa.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/d1c4dae55d1c84a3551de3ba5f478e44/86164748081.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/53541331711.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/97733573798.pdfIn PDF document text
    • http://espokebar.com/uploads/files/mujutidujafojefe.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/pomewufixape.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5efc2ccabc9668be72396b9eac539669/83301478170.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/6e4ff0645327b5721f445a5d2cd45359/22765309989.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/48117364943.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=tsotsi+redemption+essay+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_off0000de1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1F 16928 bytes
SHA-256: 707b34f5a156ba6134819ba2c47c876c5b8da84a9adfc282c79c0cf72f69bb84
font_01_sfnt_off00010990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10990 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A7 10692 bytes
SHA-256: aa20c6447d5f528eab0a1f09c4b40b48fbf3ce65b3ee99ae313f0e0fb5995f83

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