Malicious PDF — malware analysis report

Static analysis result for SHA-256 454cf7255e4acb2d…

MALICIOUS

PDF

82.2 KB Created: 2021-09-01 10:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2af362892ce68502b72cefe690d4eb06 SHA-1: 786469c71cb55328e4ea1470e5272d34b3e5cc39 SHA-256: 454cf7255e4acb2d0741ab524e0ec8d4cea9e80c1adc9939e15584fe84241a57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting it's used to distribute further malicious content or redirect users to phishing sites. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing lures.

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 https://www.agcontraincendios.es//ckfinder/userfiles/files/5888862450.pdf In PDF document text
    • http://rencontres-icare.org/userfiles/file/danewatupurilebol.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/26932353999.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/39005141695.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb14d05e21---80582029386.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/durinezigidalij.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160778907497f1---vuzekipobejulo.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210504122113.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/nomeruwaxezijamopulul.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/kubivexurodur.pdfIn PDF document text
    • http://cartopack.com/Images/file/40377568572.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/81509061288.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021622115479886.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608714241c8e9---xazajir.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/ziwikodinadufojatef.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/javonolumapekeku.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/funodeniguwikugorafos.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/53qbomu092ipmd5teq6dp3pbj3/35853671157.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b889f6f2796---tunin.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/mabugu.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611c2c09e5cc4---11178442443.pdfIn PDF document text
    • https://dcimx.com/files/tikex.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160771f4eeb3a2---sowotovamedalobejuzadosas.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/wijamikofegej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=stein+and+shakarchi+complex+analysis+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_off0000d8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AE 11268 bytes
SHA-256: 8b5eef4d6b4c6a99af22231f04bfb205fede2d8405f7dfe19bee1e6d0bab3967
font_01_sfnt_off0000f2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F0 18492 bytes
SHA-256: efdd2b5c97ee587d8b468e2b46fafdced406196b9b2ad8656c4141a7fd8a8c82
font_02_sfnt_off00012313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12313 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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