Malicious PDF — malware analysis report

Static analysis result for SHA-256 255c74ad9c07b1df…

MALICIOUS

PDF

81.2 KB Created: 2021-09-04 20:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 04c225fbc76985068bf7608a6930dda7 SHA-1: 161c245d2226cbf2d59095e993ff08d6adf0be23 SHA-256: 255c74ad9c07b1dfca5dd11add1e7db422e8a277c8606ffe84eeb6f61537c75b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous URLs pointing to compromised websites and link farms, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript, though not fully detailed, indicates potential for malicious scripting to execute when the PDF is opened.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=filosofia+da+arte+huberto+rohden+pdf PDF link annotation
    • http://trustarshida.co/cache/fck_files/file/3370066538.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160d7c5a639d1f---fupibemixebawemuxi.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/kilupuz.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a7f0202f9---9508061456.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/b48jvvth19b3nmogj8r3p10jb1/59199538815.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/erodabifagitoremomuzuw.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/44522932375.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/393b25383a9b27c04446655e9ecd920f/visasovevesojagiwade.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0addea93c---63319631122.pdfIn PDF document text
    • http://babamoleskine.com/files/file/kuvolujolezapapazoxi.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/jakefakusudewenerevefed.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/gobegalemomufemeloparig.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0fdc277c025712a109a7be7cef26035a/pinizo.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/xuvudedijijivaduwagozeli.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/51637946847.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/85238766338.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/kobivonizavuduwopawo.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210503050008.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16099f124d6fb0---57582750417.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/29737580577.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/57303517012.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/75470267314.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/74846183101.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/todigodatutesaxupaf.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_off0000d54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54F 18776 bytes
SHA-256: a8c5dc90986816c9499231287108812f573daffafcf8868aac776cb317d87083
font_01_sfnt_off0001063a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063A 10812 bytes
SHA-256: 032ca84ffb408b31168cf3d74853cda6de1713b190133e9dd173625a5f530654
font_02_sfnt_off00011ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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