Malicious PDF — malware analysis report

Static analysis result for SHA-256 973d105b0dd5cf23…

MALICIOUS

PDF

100.3 KB Created: 2021-07-17 22:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03d0872e31a6dcaac6db8b423ca786dd SHA-1: 8b90de92a10de1182f4fd7db9ddd876d8c59b2a4 SHA-256: 973d105b0dd5cf231b6d7b88746bd25c53083bc07903a8a241686f46fc525b86
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the heuristic findings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://gtnet-engine.com/ckfinder/userfiles/files/16775014734.pdf
    • http://www.niziointerior.pl/upload/file/24951399703.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/e083782ecb3c22200cf236306bd444fc/94638348503.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83a7628bbe---9062837496.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/pe0fggn6djeted4ghso6lelpk1/53721822287.pdf
    • http://hytechplus.com/userfiles/file/lorinomosiramifawi.pdf
    • https://haltia.mx/sii/ckfinder/userfiles/files/78246000676.pdf
    • https://aiwatopup.com/ckfinder/userfiles/files/46820835827.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837d73ee487---84971382734.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/fudfhhda92b40nokhgae1oc444/dogavilozevomimi.pdf
    • https://nbtele.com/en/cache/fck_files/file/fejoromuwoj.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/sb4dgr0jmmh57hu68mi9ve11n4/58146006984.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/6ojdbs33mqkpek5kt3to7vr49u/65717373077.pdf
    • http://dges.in/userfiles/file/bovulatuguzabo.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d3a699e76---51562588986.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/3ecb5d571f789acf24e82f23b839321f/59801661669.pdf
    • http://kup-vino.cz/web/ckfinder/userfiles/files/zetasufepawawup.pdf
    • http://aj-logistics.com/stock/userfiles/file/11934956470.pdf
    • https://appfacile.it/file/vexabitizajogup.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/n1r25nmc55ah8g7uqjlnkete61/tinaluvegowuf.pdf
    • https://texigo.tw/upfile/files/2021/07/02/34657985058.pdf
    • http://lyzebrno.cz/userfiles/file/galovikatinidu.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608df6df558ca---baxipedepunob.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/f7d7e8e53e95da1b39b01d683bf17ee3/radazim.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5bab342d5---lawim.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/6kvkj1kvvm62hv52noqthblap8/sibudizesovotanabimab.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=house+tully+of+riverrun
    • 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_off00012500.bin
236b1a039dd8e88b261707558778aaec09de313619f3f4f5aafe05059a8a79df
pdf-font-stream PDF embedded font (sfnt) at offset 0x12500 10316 bytes
font_01_sfnt_off00013c6b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C6B 16792 bytes
font_02_sfnt_off0001547d.bin
6764ae3269f1229aa225e328f39b8b8d8caf460517e08e674a64adf0dd2efb74
pdf-font-stream PDF embedded font (sfnt) at offset 0x1547D 18828 bytes