Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef77594e8f08292a…

MALICIOUS

PDF

85.7 KB Created: 2021-07-13 01:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b3e792fea80f8c45b7825db652bde831 SHA-1: 1ddb9ebec66cee591179d3808dc473446aa09956 SHA-256: ef77594e8f08292a5420f98335207b5ec7d9afed1b765557652e4161c62bffe9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for further exploitation.

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 https://anmimar.com/royal/userfiles/file/26728093432.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/4b46d8541c52a9842e51c5a324224a17/35049735094.pdf
    • http://i-dron.cz/data/file/27217368730.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074acc352bca---kudevobapezezapo.pdf
    • http://meble-tk.pl/userfiles/file/pizadolaxopanok.pdf
    • https://natatourism.com/userfiles/files/71183384220.pdf
    • http://jarosi.hu/files/file/95694148053.pdf
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/romifibobexatavoza.pdf
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/kugudibenotoropirin.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096819175ef4---nibojisekaviwobefeja.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b675ae82cc3---balokenimilurum.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/b844c51b20734c837449dc500c07be12/22109216033.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/07gu172ondvimu0t83tnbn6q02/96421245588.pdf
    • https://artasedanasingaraja.com/uploadfck/file/tixujemitifewo.pdf
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/98078782862.pdf
    • http://waltwhitman1964grads.com/clients/6/6c/6c9ae932573016e5ff31759a10dce4b4/File/35609358614.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/7be8efe4aa0bf9ee926f2d6ed3e5b8b4/85128019480.pdf
    • https://hse.tw/upload/file/fuwon.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2124c5b7a---jeratefovegomulitogux.pdf
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/74621189625.pdf
    • http://drshapard.com/clients/73598/File/97354530777.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/mljiju9j452n2n3f2d36cr6sav/7695649289.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607954a8b7d0d---xakibewijidofuzowi.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef053a2ef2---tisixijuxifof.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=hanging+fire+poem+theme
    • 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_off0000ede8.bin
ee44c36f52d369fdd4af644cb149bf7abdace8506a39f2d394295a47be60494d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE8 10580 bytes
font_01_sfnt_off000105c6.bin
7e182d7628ff1dde6ac25b24303d82447ed2671244cf3627f9aabefd09c20230
pdf-font-stream PDF embedded font (sfnt) at offset 0x105C6 16788 bytes
font_02_sfnt_off00013152.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13152 16792 bytes