Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee57d39bc0df863f…

MALICIOUS

PDF

151.7 KB Created: 2021-07-05 16:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 557f0dde4d51817e2964ce73d20122c6 SHA-1: f1aa69161cd17e3f246050ba0094a505049c34df SHA-256: ee57d39bc0df863fcc5f42c4de3178093056fa051ef0ef69396e4b8ff1c9d5f7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or trojan distribution intent. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9742

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 https://cambodiadriverservice.com/userfiles/file/6199600406.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/qpefmv19k7rvr0c70tvnudiq0j/46129096264.pdf
    • https://digireg.nu/upload/94361976771.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a1eab9e08e6---tipavibolozenizupokutar.pdf
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/41279997981.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072dca552515---96501901430.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160e21bf0c1707---97137899211.pdf
    • http://asbufestival.com/uploads/FCK_files/file/mamux.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/eebd0ef4573873971d2a722519fb17f2/49603291919.pdf
    • http://rana-international.com/userfiles/files/wanevorisimodivibe.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/4526882040ae0a111093d5b0ba698613/68100986975.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/6jf4i8jr4i3ldtah1g64marudr/retej.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/fccf2de3bbf4fa41e663b2db89937965/vozokarotizovudinujub.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3531086ea---segajajesobevamur.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b7c90aad0---74949485463.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fc6700f83---jakopivawodagedobirozelon.pdf
    • https://hospvetcentral.pt/site/upload/file/zivobagigopuba.pdf
    • http://www.ecostroyservis.ru/File/gataromukabovabolos.pdf
    • http://hrt-foto.hu/_user/file/bufifibamikevopib.pdf
    • https://businesslife.com/content/file/67993887951.pdf
    • http://fairway.cc/images/blog//file/57621528924.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/b3v1rdq6vfbpt8vo0lrqqop0e1/94858636217.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/9767db2ed4068e12ae55e6033f302f72/dexeporasovefazawepen.pdf
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/sasofeludopujisufuredujej.pdf
    • http://lucann.com/Upload/file/41325663826.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a2a2a0ec6---wovivutewana.pdf
    • https://narimasu-chintai.net/jcfiles/file/37550547103.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/015c4d1d764fdb015ade3287fd3fc76a/maxififixabimozin.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=meaning+of+sepsis+in+tagalog
    • 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_off0001eaec.bin
e9599286bf70247b8ddc7dc85d65e9bf0aa43fb099c4afc3b3e8f5f85c3281ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1EAEC 20364 bytes
font_01_sfnt_off000220de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x220DE 16792 bytes
font_02_sfnt_off000238f5.bin
cac2306a9696a5c25cd92cdfc86fe656ad5b98f77569b4d613854065dbf2fc4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x238F5 10428 bytes

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