Malicious PDF — malware analysis report

Static analysis result for SHA-256 c64b3e1db3219667…

MALICIOUS

PDF

89.2 KB Created: 2021-07-26 16:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9c23ac38cc398ae1c446015ace4bbb1b SHA-1: d3ddbedb984182f592d485b544d5f2d2437fc53f SHA-256: c64b3e1db32196676301e4028bbaa052307232cf2480908597b43ee77f2b7c25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to potentially compromised WordPress upload directories and disposable hosting. The primary goal appears to be directing users to external malicious content, likely for phishing or malware distribution.

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://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/pm4l2fde2nb7n5j5a4l6pn5s23/16417041390.pdf In PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e682155ac1---7360388200.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/60789c499158a5e3d94e614283e3087a/62328017992.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/eae3518597ea6553c881eeea220dc2d9/sunemajitomeneveg.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/fuxaletutolujofexi.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095da9b94a1d---wufajatar.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/65139528919.pdfIn PDF document text
    • http://saens-jpn.com/ckfinder/userfiles/files/49987321749.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/60846051140.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/27b3f0aaa3bce11edc0b62f7a38ae56d/renetaxatebepejopin.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7ca049e81---78666074444.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/35b7c3b926d8f414fb09f7652d15f5a7/sazofemulewixubinituraji.pdfIn PDF document text
    • http://cabin4kids.org/clients/0/05/050cd0fff5f75fdfd14851583cc0de74/File/munozomejujopukawowarew.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/kipuluxanipageven.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/nanafazuzu.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/31793586229.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/70448945236.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/c1b00966de7bfc5406e183cb69af1ebd/kexowodaluxidavadokikage.pdfIn PDF document text
    • http://www.bash.cl/media/file/rotuzorakefusow.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/c1j3mulvnujc2nik81ip2q4p41/gaxokezemilutafitup.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f33ca6063---rovagagulotujusixat.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/tofimadekedaxovinorufewu.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb82552441---guvak.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/jijasejexidojule.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kt3p642r6mr2jti08dbguhrkc0/mupefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=what+is+the+best+free+math+appPDF 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_off0000fac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC0 10488 bytes
SHA-256: 7462630e06e9aba9a9451b05a597a67ea96a4001d90becfb74bf7bad99581bd9
font_01_sfnt_off00011266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11266 16900 bytes
SHA-256: 638892e3a46a00a733c60705d530cd72c0ef94985eccaeaf5b51aa8c2e0d0544
font_02_sfnt_off00013e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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