Malicious PDF — malware analysis report

Static analysis result for SHA-256 59329b9291b2c9cf…

MALICIOUS

PDF

84.1 KB Created: 2021-09-08 08:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 496cb2ce93341730867393b47f333b4c SHA-1: 7a78569b3c8f06114ad84001516d3036d1e093be SHA-256: 59329b9291b2c9cfaf4b34b62f0db2aaf516f9330790d1b3b2f543290dfa787f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories, specifically WordPress formcraft plugin uploads. These links are likely intended to lure users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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 http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bf54118ab---54532584347.pdf In PDF document text
    • http://tonwen.org/userfiles/file/7915382254.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/8025861634.pdfIn PDF document text
    • http://theettiaresottawa.ca/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/kewumuriwijogerasig.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8229428d4---diwawodedodokemozip.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/910159e3e00367a9d3a8c99b93b81a08/neruxaw.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/kevobu.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/zepekerubotokanezi.pdfIn PDF document text
    • http://cutskytools.com/d/files/pokevizutubi.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/bazuwaje.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/48734563111.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/43431485462.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/084388290be9b86faed485ee04511b00/21309316259.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/xaguxawa.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/68004637803.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/sejotawofijipujo.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/31245508008.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/89005479749.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/zurika.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/74787017944.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce371e214e---puporepezojurorujof.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/ds6hj4c37da43smtgesaf8sdt3/18830072883.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/kanatorovidexe.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/fojojozudowe.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/d7272d090f55066b9b32a1b0a8583445/todibitodowoximalovawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=create+pdf+online+from+multiple+jpg+filesPDF 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_off0000e29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29F 18028 bytes
SHA-256: 98e68ce6d1d9c87f8b00a2c747e26786b53d72eccdae22af12be6054065d73a6
font_01_sfnt_off000110bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BC 11100 bytes
SHA-256: 9e7e6592f7f0c0c1cec4a4cc56acb94ee0476c2840d45830ef0de2301e567434
font_02_sfnt_off00012a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1