Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35c0f903da4cb75…

MALICIOUS

PDF

83.7 KB Created: 2021-07-19 03:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 804e0897dcfa1272a9e35787a5ca12be SHA-1: b2ac4a4cd9e84f7ddc1c50fa118472b4eac94112 SHA-256: f35c0f903da4cb75af68ce593f9a9a796a39611e1aaef85c393af8d41dbd0726
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of a link farm pointing to compromised WordPress upload directories further suggests an attempt to host or distribute malicious content. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://centralwestwoodclassof1983.com/clients/c/cd/cd4b3c89dd1500142a52f05b9125c350/File/gukojixaximixatasenorusu.pdf In PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/985ab1e3e552e4fa584f6c5a3071104c/48762947688.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/tarenitiz.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ad032b1e2---wizifelijibokosezepowavi.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/90ec370903a069787bff4381c623793c/69175617830.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/6586412113d1479cc21049177d2f9011/77633384407.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbcd110729---vevuzijemitesotajipolisun.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/69956011794.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/9178915440.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/74676288337.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/7e90b82282f931e704faf81c88141734/12192109163.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4191ccafa---53319937624.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/30004862509.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b795fd1a3b6---zobanarasoxabusonudev.pdfIn PDF document text
    • http://garderoba.sk/images/_file/26374661048.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6579929c0---xapibomibefadedi.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ura2ojrgr7ietg075454s0kvb2/89779947611.pdfIn PDF document text
    • https://carlojans.com/cms/file/82453806082.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/77557291510.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/lazetemuwemamefi.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094db4c18798---rovugovisuvu.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/f4e8e6213ab8cfe8e4ac3b74fb605729/miberitalamesuniruzelug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=fledgling+out+of+nestPDF 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_off0000e6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F4 10344 bytes
SHA-256: 3926529c5356b400dc179e0a79ad6c0fd9e2603e93729c733e20a8108db333db
font_01_sfnt_off0000fe2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001163f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163F 16764 bytes
SHA-256: abc2633cac77ca9d8af01759a1ac6da0397e6e4d414a5f7ac5681fca267f7163

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