Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b45b7912f36223…

MALICIOUS

PDF

85.0 KB Created: 2021-06-29 01:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3fb1bc0e6ac4b55e031a5271157966f3 SHA-1: ad96e8095b20aee01671f6d4bbbfb133953d9e96 SHA-256: 66b45b7912f36223519eb18bf295c0ac25e3dadf908b9994aea208f822746b6f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malicious content delivery mechanism. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host or distribute malicious files. The presence of multiple distinct hosts and URLs, some associated with disposable hosting, further supports this assessment.

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 http://entone.es/wp-content/plugins/super-forms/uploads/php/files/63bd687f3898d7fe18ee7391eb3d6ae2/nezeletozadul.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/73bde4594e8bd7be93a9e9d753527d78/25265183296.pdf
    • https://vieclambaohiem24h.com/upload/files/ridali.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/2uee0v8rgj94v5q056ktnhlrv5/kegapifimirasotum.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92939997cf---76420389325.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a55518c51a---tateduvizumimuluk.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfb0586d85---wunowasifofera.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2566e7a7ca---65721646566.pdf
    • http://maychamsocda.vn/images/userfiles/file/54771137866.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aebf82a1010---88403669698.pdf
    • http://agendatourvietnam.com/hinhanh/file/bejakidijonen.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/518900386ca1109aa3935ed28a38ea32/55854580468.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e340422b6---45265452621.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607c0a3e84eb8---85916845976.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/d7519b3057967ad013560e9b3feeff17/82301489382.pdf
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/pivajoli.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/cd8337632218d87feeffcbfa3e5f233a/43010912441.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea53b63c11---riwudisigojos.pdf
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/99305150389.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/3b526d02beaef5bb05e1a05eab049164/mizuxagavedatizepafidamel.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e83a234966---27714631848.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/r574f3th05ehdsifhdj7rfb4mj/70870286524.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607cefbcb0e37---58928326274.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/cfa0df8814be201df799e8f6ee8369a2/98526243831.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f34c939ef---81078608977.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=set+a+timer+for+1+hour
    • 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_off0000ea39.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA39 16792 bytes
font_01_sfnt_off0001024b.bin
bec4e58586076fe5131cc45b5add6529828832f6ae18ea4189d65b8a0a873129
pdf-font-stream PDF embedded font (sfnt) at offset 0x1024B 16780 bytes
font_02_sfnt_off00012dc8.bin
52127a13519c11f7bb52c0997b1f4cadc89444cc9ef39106a2e9b9a62aeacfde
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC8 10388 bytes