Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4fad0d841dbc10d…

MALICIOUS

PDF

73.4 KB Created: 2021-09-11 13:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cfff5aad248155624c7397eee79651c8 SHA-1: e8277475dfe16ae5d55ffc8baa77f2fd21b72b45 SHA-256: e4fad0d841dbc10d5bf5e6e91aa85054a37c930f2effe969e6cf81c092da842f
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS uploads or appear to be disposable. The presence of these links suggests an attempt to redirect users to potentially malicious content or for SEO manipulation purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xn--m1age8bh.xn--p1ai/files/file/belasaxev.pdf
    • http://capitaldanceacademy.com/userfiles/files/vufusoduxakimox.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/a0586b404d97d3f5b4672da32ae2acfb/47291015843.pdf
    • http://microcement.ua/userfiles/file/kejumolixusideso.pdf
    • http://consulcongress.it/uploads/assets/file/26062935736.pdf
    • http://geyikkimya.com/userfiles/upload/file/gixofazufidabuz.pdf
    • http://grafiport.com/userfiles/file/29361818144.pdf
    • http://uran-berlin.com/userfiles/file/pokolawosa.pdf
    • http://alhambra.kopanramen.com/uploads/files/woposusemixidaji.pdf
    • http://hytechplus.com/userfiles/file/sewabude.pdf
    • https://simpangkanan.com/contents/files/28623222604.pdf
    • http://easyliveconstruction.com/ci/userfiles/files/75415208309.pdf
    • http://hainescentreasia.com/images/file/limirometugodawuv.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/a2b00f4b2544b80a28c27d4afb3f5b72/dazenilifuzodufes.pdf
    • https://smgbid.com/ckfinder_userfiles/files/xekapatepuwibolawegomopa.pdf
    • http://podarox.ru/public/files/bexeg.pdf
    • https://nhuadailoan.vn/upload/userfiles/files/91653152505.pdf
    • http://asvpp.fr/pdf/gilavalefozasoga.pdf
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/gubutosijadeloki.pdf
    • https://karlschool.org/uploads/files/202109091428277803.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b8102d46d---19000895630.pdf
    • http://langfordfinancialservices.com/userfiles/files/66834183873.pdf
    • https://villamishkan.com/310renonew/front/images/files/89631524521.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613359897778d---33381007368.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9d0ac4699---4874595900.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=project+makeover+unlimited+money+hack
    • 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_off0000bc88.bin
8a5da66ef366bf934e64a8c5663556a2ab766387c601dfd81ef0225cf4981b78
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC88 10972 bytes
font_01_sfnt_off0000d5c1.bin
8acaf1e047b304da70f4f2a0f64874d1e22780bf1ea1e2ca9912da0d84c9d959
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C1 16508 bytes
font_02_sfnt_off0000ffed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFED 16792 bytes