Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba654a6e1bcc5c44…

MALICIOUS

PDF

72.2 KB Created: 2021-09-27 00:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 879ad1bd897069079808e8450fc55f2f SHA-1: f2b565b1ff01128bc91de67bf554d4aae7d06b45 SHA-256: ba654a6e1bcc5c4474fcce35f8ada6f9b995718e02b42c34e63247440c0d36a4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a common lure for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://huntic.ru/uplcv?utm_term=lie+with+me+full+movie+online+123 PDF link annotation
    • http://zhongguohuachun.com/d/files/damamamuri.pdfIn PDF document text
    • http://moderna.technology/fckeditor/editor/filemanager/img.php?file=file/57759876709.pdfIn PDF document text
    • https://eniedu.com/data/file/20210912134713.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/m0io744ot2oq0resqsn55aqkv6/sefowib.pdfIn PDF document text
    • https://pr-dienst.ch/file/53967410800.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/11801119540.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/47984906176.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/82938674412.pdfIn PDF document text
    • https://hgb.se/filer/file/38834725516.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/3ea10778761e47b4dd20ed1d3fbba14c/vobid.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a341758b43---57163820575.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/xisivufozujovipejataw.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/towikezukukevoridosimix.pdfIn PDF document text
    • http://kd-council.com/upfile/files/vufutogepaw.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/21384792669.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/34954127114.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/9348502927.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/71152255503.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/dofijazakalogilepojesuju.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15680273413.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613723a6c724c---8492212725.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/84599349513.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/kupuwumuripef.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_off0000b516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB516 10604 bytes
SHA-256: 5360b8518846d37bf3c748bb49e905a2d792c32338c082a3c14a21c579ba8681
font_01_sfnt_off0000cd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE558 17784 bytes
SHA-256: 35f52c2623b30f963c053599c3eeb7f866457110a3cac53c2da1bc6ea7fae45d

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