Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a325b08d1c4359…

MALICIOUS

PDF

89.6 KB Created: 2021-07-27 05:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 05329a9168181283fa98f3296de2a75c SHA-1: 11bfdfde430064ec41abb42807a2fbad2eb10c29 SHA-256: 77a325b08d1c43593d99308a97e636c2674a43c72b3fc5619f3bc83b28e2954e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious files. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/37018e55991fd68cd385ebfbb1e472af/mivisolaxewoxipulogodiw.pdf
    • http://goldmustang.com/files/files/10596794865.pdf
    • http://szakkepzosiklos.hu/upload/file/jurusitulopigulelikiwi.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af002604e80---xivesofif.pdf
    • http://bartuceviri.com/userfiles/file/jeresovaneki.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/bsftbd99gvatm99lolhpo0mtb0/wuxosawominadomewiz.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1609c243bd96a7---585531773.pdf
    • http://sb-78.ru/files/file/29715961317.pdf
    • http://cuacuonnhanh.vn/Images_upload/files/mesamavadofum.pdf
    • https://micro-churches.net/uploads/file/favogoxiwez.pdf
    • https://carcable-bg.com/uploads/pictures/files/13237440817.pdf
    • http://driver-jazda.pl/upload/file/5056223885.pdf
    • http://kxnjl.com/userfiles/files/70623889860.pdf
    • http://szao-spb.ru/images/news/file/tofabuwigurupodupovu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e51d2dea4---12608131778.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160858b0551bbd---wesisuvuwegaze.pdf
    • http://nedirajtebosnu.net/userfiles/file/xemawe.pdf
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/n1m8tbkrtqjsotf25bmedd04tm/73871112894.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/65r9l6h7be1jd5vmfvlcrtbp61/solemubizinofip.pdf
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11860189906.pdf
    • http://zentrumok.com/userfile/files/92744638101.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608169558e3a2---zivedepoziruwifole.pdf
    • http://zuche0551.com/upload/file/70762204490.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774ae2a3da1---31807945251.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160759026b141d---95962875038.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=pes+11+android+apk+data+download
    • 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_off0000f61f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF61F 16792 bytes
font_01_sfnt_off00010e31.bin
fa7b7d3e721542887f742192bf0b97400c24be27be6e77991d3d79e2192d486a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E31 18168 bytes
font_02_sfnt_off00013dd3.bin
c30aca224aabb9f0a654c59526d2b58c3878fd5acb6b32798296b5e8502ec055
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD3 10616 bytes