Malicious PDF — malware analysis report

Static analysis result for SHA-256 feb22c7d56d1f82f…

MALICIOUS

PDF

69.6 KB Created: 2021-09-28 20:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 205d6602cea38ad39dba191ce62ef7ea SHA-1: d1b24ac8f911049c7468d03ccd625d5721095b26 SHA-256: feb22c7d56d1f82f0d0601632b88681195ff57a7b1ac026ad70a953d29e8e149
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The presence of these links and the overall heuristic firings suggest an attempt to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://xn--80aa5alfu.kz/file/burililexesalof.pdf In PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/kivelogutuf.pdfIn PDF document text
    • http://koutingchina.com/upload/files/dunuwexubagazutik.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/gidixinovusuwudetosupej.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/pewotematizetatukuxamim.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/xutugasudisifaxonojo.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/kiduv.pdfIn PDF document text
    • http://goref.ru/files/file/zowobudomazizumozunifovem.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/73790719423.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/30487678020.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/gukopamozapabomedu.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/60168367033.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/soriza.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/wunivawujonewo.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/subugulolixofo.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136706918fef---84521740791.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/50162033359.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/busoxagikubazemi.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/polibagufa.pdfIn PDF document text
    • http://change4best.ru/upload/file/96026325193.pdfIn PDF document text
    • http://matras-devison.com/upload/file/pomifefawe.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/r25se49gcqmsrv0eahc4vgrmjs/kanemenuxo.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/falorozeno.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/72333104217.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/gudasamapu.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7267b16cc---dozajutadovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=access+clipboard+on+android+phonePDF 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_off0000b451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB451 10636 bytes
SHA-256: 606a494909c80d923e6b3be1f9e3885869e5a4a0b4f9275b6ea0c6a2e143b1e9
font_01_sfnt_off0000cc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45C 14564 bytes
SHA-256: 4ed628ad925419a17f72eea85e49e49abe4ee0da2718d7f7dd89042592011e2d