Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af5bc7574179199…

MALICIOUS

PDF

83.1 KB Created: 2021-10-07 18:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f77289835c66dbfbe3a02ed38f9125bc SHA-1: d2d459b455c98e0558fbef7f45f3ea449f8e9e20 SHA-256: 4af5bc75741791993d0ef6de0be0b709da02ff8e154c09eedeaf7b0cbdaf9624
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting. This suggests the document is designed as a link farm to redirect users to malicious content, likely a phishing or malware distribution site. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://biosurfest.com/userfiles/files/jefonoxomovevigidisojozut.pdf In PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/kuduwurojitozul.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/kizufutovoxu.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302947ce543---ludelatatave.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/53518517087.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/86868782029.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/49709360300.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/58964689046.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/vekadozisil.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/35884616658.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/1098772400615b199081e86.pdfIn PDF document text
    • http://szwygs.com/upload/16337043358.pdfIn PDF document text
    • http://onelove.cz/file/65396632976.pdfIn PDF document text
    • http://biomehl.com/images/content/files/80838132306.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/fesexekogejagidopo.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/1123142212.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a29e6ccfa7---venevafonedo.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/difotevimezijibinedosat.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152e7facf168---vozubig.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/24488330735.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/54fghq7j9eisanqt4bj7244oi4/374531933.pdfIn PDF document text
    • http://ihdbd.org/upload/files/69839787014.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/mukojunonezejanabebodi.pdfIn PDF document text
    • https://jss-moms.si/upload/File/dizotebipikuz.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/10416669525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=160+ml+to+cupsPDF 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_off0000dc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8F 10288 bytes
SHA-256: ad4d24e9fc905e6fc9aa4f63d6649f18ba705724318d8b212248d59099d0ed6d
font_01_sfnt_off0000f3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDB 19564 bytes
SHA-256: eb185a6feb20385633cdc709008b357e8a2747d4b3abac6e84e79fa1586780f6

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