Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f2b3e827636cab…

MALICIOUS

PDF

82.9 KB Created: 2021-09-06 04:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0156323f7eb00add095f180a8d9e5155 SHA-1: ea6cb6a7e8ae89bb8db1dfc12f549f978e0bab84 SHA-256: f0f2b3e827636cab4144a78b77c1451ec06775476b90f968c124857a7c2b3372
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites and disposable hosting, suggesting it's designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/989dfef3446d632ecc3c2bf4d664c3e0/16413199544.pdf In PDF document text
    • https://shreenathtechnologies.com/userfiles/file/xujufilaritaguxejupiw.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/48439408409.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/16128799007.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/velenozuludazad.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/8f58fabff8f766777dac7bf25a7484d9/movarusun.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/xarajaxadozigutikixe.pdfIn PDF document text
    • http://zlato-stribro-investice.com/upload/files/5195447646.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/89766545375.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e04882ff48---kisamumuzejazes.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608351a0b83cc---39632192305.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160a4206452c71---moropimaz.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/sezuwijudirit.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/6ad123ddfffa6563da641f7fc5020de0/xeviwokiramuforaxebi.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfa6884bfe0---gululaxida.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/jiworoneg.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/sewonofivazebudeba.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/tajaxulutezad.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/b7043d1f4b1152f772ac0b2b0c4ab55c/pevaxaginasexo.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/manopawibipel.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59cc3529b5---93333130102.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/60776393306.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/4802166144.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/3q8j11d6oeh4lvame9eh3k12mu/gokowasakasun.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608c517fc80d7---41278904823.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=tastenbelegung+klavier+pdfPDF 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_off0000d76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76B 20344 bytes
SHA-256: 195c751192f440da50791f0325fc2022d284d53baece6bb92dab0fc3ea175026
font_01_sfnt_off00010b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6D 10912 bytes
SHA-256: b4ed842c4b4394ca1ff6d002cc615a739151aebef0a7ca595756c797b67d02ea
font_02_sfnt_off00012473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12473 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1