Malicious PDF — malware analysis report

Static analysis result for SHA-256 f450a7bb331bef3d…

MALICIOUS

PDF

68.6 KB Created: 2021-09-30 11:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d9a6b552565491befd19625870ba5d02 SHA-1: a9b71c05f13b2471544a327ccd367cd82fedbb38 SHA-256: f450a7bb331bef3dee440e1511ccc14b1fa3499a6f4421592e6e413642057aaf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including being image-heavy with minimal text and containing numerous external links. Several heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://poetische-malerei.de/web/editor/files/53499977006.pdf In PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/74019372286.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/86072897861.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/1394728586.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/raroba.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d0252126b---28699407249.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/55705268394.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/fibelosafoxozuluz.pdfIn PDF document text
    • https://ubranni.com/uploader/files/5463602190.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/3f390b74c79a6aa4661aa62f6c081cc6/zakezidilesesedexo.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/65609941381.pdfIn PDF document text
    • http://sov.tranovice.cz/webpagebuilder/ckfinder/userfiles/files/54983424100.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161544633b3a42---jomirowepusavapa.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/80789448962.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/wukuvuluresupeket.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/xusubabunikob.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/zutimasotukal.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/14219579023.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-2/20210902045806925986.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210908044809.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/mevetokajapusojafok.pdfIn PDF document text
    • https://12shio2.com/contents/files/lunirivilijebiji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+transfer+files+over+wifi+from+android+to+pcPDF 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_off0000ac70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC70 10924 bytes
SHA-256: 5e31108ac5cc114204d94b663dc781b8324c0eac2f26eb909d4ca0e4c8e8f745
font_01_sfnt_off0000c5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BC 14748 bytes
SHA-256: ee478880600302292ec4e6d0ff96c66f2530585b0b3f0bf313d5ea9cfe38d94f
font_02_sfnt_off0000ea86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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