Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f5c0060fc73fba2…

MALICIOUS

PDF

90.2 KB Created: 2021-08-03 20:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3d3bf71517c53a82d5eb64e14d68331f SHA-1: 6fe5ffd11d53e034ad220dc48794e5d81977a1df SHA-256: 6f5c0060fc73fba29f4caba9ab511e38ee20e80632370e10c6ad93e8ccd64bcd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to redirect the user to one of the listed malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=solo+una+cosa+gary+keller+pdf+gratis PDF link annotation
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/7ff2ea686c28e9892e76d446904c9f6c/92982519803.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1303aa02d1---tasudajodagejafowebawi.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/77515474319.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744972bba30---musitubevigosubidezazalut.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/dipitunadexidowalezu.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/54570746581.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/ou22kuvgi6cv8r8dv1forh7l7s/najopi.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/2833232354.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/71257979199.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/27569889858.pdfIn PDF document text
    • http://carolstoecker.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/80737088612.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609892c5c1965---76415840999.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/39471562530.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072d2f53a4b5---motobe.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/72507281337.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/27704058198.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d78e49ed5ab---lemomi.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16085514d89d70---80763268145.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3a2f295b8946eb751d93dff504a96e8a/dobovedokekifogenibisev.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/42113758603.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/f5ddced84cbfd79e5661864b732ee42a/19030752449.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/tukutilexigo.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/v51f6lvrmn4q25mqql0rkok0a4/nukasiworepeje.pdfIn PDF document text
    • 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_off0000f637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF637 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4E 11176 bytes
SHA-256: 26dc67bdc9e165e03f30301e2e60d9e468c3df872b0d5e05f79a91992469dd3f
font_02_sfnt_off00012862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12862 19236 bytes
SHA-256: 0620a4314da36491081c90714a372f2f35cfb1e6a4ab30ec1796e4d97cd6e573

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