Malicious PDF — malware analysis report

Static analysis result for SHA-256 c179afe3aefffdb4…

MALICIOUS

PDF

76.7 KB Created: 2021-06-26 00:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2eaf831f40783c6adba896eded52b232 SHA-1: 85f1e9b1adaa7a0bc0ac2fa72a0a958b3a706008 SHA-256: c179afe3aefffdb4447225d26875eed235eab42a87b5d6351400a01ca420ba92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised WordPress sites hosting PDF files. This behavior is characteristic of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16087df0636e85---85561489978.pdf In PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/72be31a587e6f9012b2b098e22090ad0/segizola.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607600cdf3e86---natidemigu.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/39d2q2l7cj61ricm8r0urgirer/33814343064.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16087269959d10---62044886130.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/komajuxeluxukagulikudabi.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/75625756729.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/17771342259.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/e732e11e990aa2388cdefe96ad6ffec9/rukarekoxudaviretijeb.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca030bcd6c---donodogibumelusuwukowera.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ou0c3liqcvsm0dl143jqefpqb6/9071955291.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bbe0e316f---piwokojixezinov.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210607_132327.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/norofa.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/tebunaweviwu.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ef7di68rldeg3utplkanmrnqm3/xatoxojezowidukunifoviju.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/ce9bb78d4e0d1c6076b3dbf64c0c78d8/5475153957.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/8340fd2db2323fdf8c490ca839d41ba0/bopokunudumijojet.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607908b978de0---zekosuwituwokoriridu.pdfIn PDF document text
    • https://samowar.ch/upload/file/tudami.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ad2711f33---rolakudibotek.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/dubawepamumex.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a50ab61c6f34fcac1cceafec6885aaf2/pibajaregaxaxokab.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac421fb23d8---xoxivuzoruvigol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=do+you+have+homework+in+collegePDF 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_off0000cb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE337 16064 bytes
SHA-256: 9121af72d387dafba0444431cb3fd4bee08da25aaeafcce8e14be5be87a1894c
font_02_sfnt_off00010c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C90 10868 bytes
SHA-256: 5729c3c14426666c56cff65d183287c87c875dcd34209a720dfb5a58f66a33d4