Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8774e45ad626872…

MALICIOUS

PDF

70.3 KB Created: 2021-08-27 20:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c33b189d031d93cc948fcdb7023eba70 SHA-1: 9a3a60fda66bc68518fee517cb290100aa14b761 SHA-256: f8774e45ad62687248ee12dd0bbe9fc49180cd5584e84108db29ce7f7296bdc1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting domains, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the extensive use of external links suggests the primary attack pattern is to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pixomot.ru/uplcv?utm_term=healthy+meatloaf+recipe+with+quinoa PDF link annotation
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16076fcbde66fc---46171344086.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/77674784377.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202108240900497334.pdfIn PDF document text
    • http://jucal.es/images/file/88384875516.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/96655538412.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/35255052928.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16094146891e57---46614274481.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/02166303efbb8def4448dff0cabe4774/modapegitetubupebem.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/mujutuvivo.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/54626001273.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/joxamafakezobavimuk.pdfIn PDF document text
    • http://turdv.ru/SITE/files/editor/file/92342351306.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210705205332_thhhsz.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/e3326adb8c726bf1578661b954c3da09/20215483916.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/60688723062.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/28590384406.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/jiuk1bt3d30ep42u5glqiigh97/nusovovorubag.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/vixipipiber.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/bagigomozebunezafoliri.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/76cce679d52594aec17fcf0bc6f40769/nofuwukivalujet.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/rovukoregojukamato.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/njqseehrgefe3fg6hu2qddrr2f/65854608460.pdfIn PDF document text
    • 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_off0000b4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FD 11016 bytes
SHA-256: ab9e20d02da8d20c539c80acb375bffe685e15f139a5d33fe8235ac53fae08c1
font_01_sfnt_off0000ce5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5E 14628 bytes
SHA-256: 0f85352f858f088c3cfa78dcf0a90300b2f6177d14b9669871e897066c71a8b6
font_02_sfnt_off0000f2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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