Malicious PDF — malware analysis report

Static analysis result for SHA-256 5833ccabf3594a7a…

MALICIOUS

PDF

71.9 KB Created: 2021-09-01 00:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1b0c3d2f94a75c7939e36e3f87755bd3 SHA-1: 8af828671922316d3a1e533089f63f38bcf9b325 SHA-256: 5833ccabf3594a7acd34373f34abce47c17fb1e007dced808f5121932fba6f6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/tuxowudereripivim.pdf In PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/luzosoxuvilajamuzovuvi.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/71737698718.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85f8f3df8---vaviparikix.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607add2c547b2---43661163095.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160977f7e44ebc---naromimepoxem.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/r69f9c445dki0v8c01slj6lrfj/wumopowose.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/b3a17c298b2986c495f1033bb3346679/11194707837.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/fuririparanofabewoluwa.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/seximobiso.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6a1a5171d---1996534880.pdfIn PDF document text
    • http://yuha.be/_files/file/gebajilotenoxotub.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/29296483735.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/dusifibuwed.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5c32d8f52---popopiz.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/22233754840.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/65573558894.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d60ac57ad8---berurikikava.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0f050c24c---9126415439.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/1b2595eb837eee12d9671d3dd437c11f/14444434808.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/vavividuroxazekilazunula.pdfIn PDF document text
    • http://sweden2020reunion.com/clients/e/e2/e2375cbe45a1e08e95d3a39ca41e84e3/File/gefuba.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4736ed9d6---jurugegapuduxutonevovovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=revaluation+of+investment+property+frs+102PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB99C 15256 bytes
SHA-256: 5462b7e3982c574e53157de5c019aa7649dfe2582816d09205a20743773da25e
font_01_sfnt_off0000e00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00C 11136 bytes
SHA-256: 5d1d2f814cb0c60c61756afa452e55658523ed9c8cc879b78bf2cfb26d9686bd
font_02_sfnt_off0000fa25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1