Malicious PDF — malware analysis report

Static analysis result for SHA-256 2377511ef439877b…

MALICIOUS

PDF

89.6 KB Created: 2021-07-01 12:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 33c14d68239d37dd28baafeaf8cd1be1 SHA-1: 78b365ece6a6defca8ecdebcd62ba9ca845821d7 SHA-256: 2377511ef439877b235ab9c0cb3a17d998d0d71547ae2a879fe7ad052afeb38d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. These links likely serve as a distribution point for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 https://almondzwealth.com/administrator/imagetemp/file/nomakiziriro.pdf In PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608823a970b8b---68739628559.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608982a7f3e4d---76997011968.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/39d06dcc484f1d124e40678518b4ed7f/kisar.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2461b8f61---17584416262.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/981c6ea0ec66ea5bd2950290fe61139a/11420895900.pdfIn PDF document text
    • https://stopserv.ru/files/file/69029631420.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/fuvujorenelawanodemamus.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890bf7728e7---56442069905.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/39393385261.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/64582310762.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b56ffc6eb35---83828785404.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12df9e598a---sizowup.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160835090c9587---30319249743.pdfIn PDF document text
    • http://garderoba.sk/images/_file/25784223961.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16076cbb9061b7---kaneki.pdfIn PDF document text
    • https://bataretak.com/img/files/file/vunefaxakimuwipefi.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/4psng5561q6rete8dhse9u1717/52364011667.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/58295830573.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/8654754488.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a059d5c0959---dudinizok.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/vetuvoz.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e02d5fa98---63127199316.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/ginapufenoputerebuxigel.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/e2047c6e9bd5fc80ed4c294da8934075/40485044259.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/48103804796.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/0rse3medpdvcd2ib09274js82o/31926393471.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=sermon+on+repentance+and+forgivenessPDF 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_off0000f2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABB 11060 bytes
SHA-256: dece3ef127f07e5d04fd48dfa38883a85f1c73d8b0bdd6da008603995d68bc26
font_02_sfnt_off00012448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12448 19540 bytes
SHA-256: 2dfb7e667cc9e0e25ac6fcf833e547fd0a3b84529388d71db9f492c7fb501398