Malicious PDF — malware analysis report

Static analysis result for SHA-256 022ba13e50461613…

MALICIOUS

PDF

91.7 KB Created: 2021-08-25 00:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e090c2cc9eba4061ec02cca5adf7cc7c SHA-1: 92c6df55db65b033c5f51caceb84149eb1d91d6b SHA-256: 022ba13e504616130dd7373a7284ba20cf895521e586a6abb013b0d1af555ebb
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 http://wildzipper.com/clients/wildzipper/userfiles/file/46605076908.pdf In PDF document text
    • http://allnatureint.com/userfiles/file/kurajovopemugo.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/u1lcn7gksmnq5399a9k9tgb4s6/66353473834.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/fujokadejopo.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/c4439725efff85a5bcbefeda5a4e66bb/fozasuvad.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/vivepuvemijanurobinaxu.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79e295549a---noxikikavulimiliveke.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/pll2qdn3tfme8bu0ee0t9mu61a/sovorozivif.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941dff64c37---13217319705.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16095e70facc80---wamogesafoveguganafido.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8eb4226bbe---ziseg.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16072a8a5c826e---83664068391.pdfIn PDF document text
    • http://zonwering-nederland.eu/ckfinder/userfiles/files/pikitot.pdfIn PDF document text
    • https://dacola.com/upload/files/mevaxefuzujor.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/miditefifodo.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/nenibuxinepem.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/f29382c50cbfb1ed2a03d3c34452fb42/50587865090.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/seresadaditadetifi.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/jvabt9bb3f75esgad3g52q1or0/65458878222.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/76049732081.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/6d11bm9ob0dpfvhlgi87ft8ikd/nusosusekigixuxojozo.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/kanubugodozo.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/tot7mc2u50csdsellul08sn5ff/77786898421.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/4d84384932c7aa9a43e82a33c18fdb49/75520837190.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/b617779f5ae563ecf07a7c3912d53b2d/55676928352.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/e0962aa2c1ffd1f8ebe2ddc87382b5bb/gepizexixagegawozobovikad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=seven+deadly+sins+s4+ep+1PDF 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_off00010007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10007 10452 bytes
SHA-256: 867794374b480ca6ffe42750c2e04d1df3729fb148327320f52a112604414150
font_01_sfnt_off000117f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F8 18324 bytes
SHA-256: 46ff657c0f200833b9c8dc0fdc10eade375fd334296e854a2ed16f23ec22421f
font_02_sfnt_off0001481f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1481F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1