Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcae9f5459f1b376…

MALICIOUS

PDF

90.6 KB Created: 2021-08-15 01:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d909fb78cad28ddc2b291f733bb54bf1 SHA-1: a39fcb58f3ef720e2ebc1ce21554dab4ed7870e0 SHA-256: dcae9f5459f1b37639a205242f33034277e468ef3e6276069ffedb35ff34a811
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 multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of embedded URLs and the structure of the PDF suggest it is designed to exploit user trust by appearing as a legitimate document while leading to harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/a3f4760a0b1b929aa620790cd4789707/pojozegudawujasiwosu.pdf In PDF document text
    • http://pwr-tech.ru/userfiles/file/sotomutigigejedo.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/99866946837.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/90912427738.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607391ccb3c07---56370460569.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b9e743ad5---wobejinularebawizefiga.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/rogolowaxepoza.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/09ba08af795159b13bf126495339d5f5/2168614988.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/20239875663.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b51d1d02c---39506479711.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e12026dfe2d---65409655207.pdfIn PDF document text
    • http://keacg.com/upload/files/54348180626.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091554556029---jarobena.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f339b276d1---2027022406.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/iffc9lccge2b2ij22qroagq7k6/nekudital.pdfIn PDF document text
    • https://duel.pl/userfiles/file/xaduxadokigimemebilofede.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16228335066373.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/38247395616.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/gokowitexefi.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/35262254581.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/28302863130.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/a3242057146fc7caba675cc9af023059/65452603533.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/72bf1b57c2f44585a70234324b54f1c1/winebepikikarunolof.pdfIn PDF document text
    • http://cobbpaynefamilyreunion.com/clients/862770/File/kukewi.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/58818573316.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+do+i+start+a+banquet+hallPDF 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_off0000ff5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11774 10808 bytes
SHA-256: ccee9b35dd82f53a7fd3e37b5ded9ff707c4b05db04cdad7108c55abf55af3a4
font_02_sfnt_off00013013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13013 17108 bytes
SHA-256: 0a5d3061e9bee873aa9fd0921616f86885426a556467ba0384004d270e383455