Malicious PDF — malware analysis report

Static analysis result for SHA-256 854f24bfd4946fc3…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 14:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 48da9b1a6a207eb97cf982f047384265 SHA-1: bfa4a10474722f4932150c4d6a180153eafd550f SHA-256: 854f24bfd4946fc3d8eafc9e07310b1f7cf6649a02ad8d6b3ee6ec537d2e988c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the nature of the link farm and the detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pernambucoimortal.com/imagens/files/dalol.pdf In PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/lopamomafaxijuko.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/36769779397.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/rokukerakusewexovezugoki.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/21167312291.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/79650096763.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210904045027.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/43909294831.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614dd2b3900c2---55826056287.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7ea6eaa07---63250764067.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/26133989749.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/fijazitezutewagufaxipezug.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/5841bba46c3027e93315b8842cd71e34/vuxatiwafuzo.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/neliloxikexazo.pdfIn PDF document text
    • http://kasargod.net/uploads/file/tazuzevotif.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/gmfkujj0g2s7n5fad7ljebeg03/tumakepafidokogolefo.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/58782503321.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/wuvebalikawanufuruxemotam.pdfIn PDF document text
    • http://dobermanncz.eu/files/40198724678.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/42418796921.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/mesefudux.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/loduwopid.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16149416d628bb---gojigiguzakosawiwejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=varma+movie+download+isaiminiPDF 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_off0000b291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB291 10432 bytes
SHA-256: c4d23231cc8e4eef1cf891021f8c3eddd7780909f12606117d85827fdc5599cd
font_01_sfnt_off0000ca36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE248 16696 bytes
SHA-256: a31da9fda1ccec4be69a743a7d0c5e1055188c80c45870f79ea998840bcd90fc

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