Malicious PDF — malware analysis report

Static analysis result for SHA-256 84dbdd2c332f1caf…

MALICIOUS

PDF

81.8 KB Created: 2021-09-06 16:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 403dfeec52a835ba7631fc5b20039a95 SHA-1: c1016b32828041f2510263b041bdf63015fc1571 SHA-256: 84dbdd2c332f1cafcfaa179924e883693053a2b33bede7e2f2084cce53a9c81e
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious destinations. The ML classifier strongly indicated maliciousness, and the structure aligns with a link farm used for phishing or malware distribution. No scripts were extracted, but the presence of multiple compromised CMS upload links is a significant indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://ketchas.ru/uplcv?utm_term=nyc+map+subway+pdf PDF link annotation
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/3taujgds5j14qf7ip79hir8ua2/70962493213.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/63806826700.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11ca092170---rewawavejenidutibigin.pdfIn PDF document text
    • https://mauspro.net/upload/files/manitokudifirawaw.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/19195880271.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/tuwaxebusumom.pdfIn PDF document text
    • http://vswet.ru/f/wijisopenenizutuwut.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/posufuzuvubiretopotutuluf.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/81610497235.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9146f36408---72622510009.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/vaxato.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/numofapusipifivovibox.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/aa278cd06eabd978f259c2e9901f14e2/runodavipakex.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/96gk19id12t5jat5daikjj0cvv/64631346292.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/tolavikebo.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/loxekapojepalulezepasafux.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/5530565093456e8db4d103e4f1a53644/74019050545.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/33282076066.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/1a9eab2a2ca2922f820a400cd86789f9/18456720614.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-7/20210507001805266718.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/jatebekumimutis.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/0ac52dee77521273fbf97ad0ff997778/31307598121.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_off0000dbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB5 10508 bytes
SHA-256: 2d9b111531e9ba2a69025314109dc93318dcda2f2ce3884eaafbf16a1a12eede
font_01_sfnt_off0000f380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF380 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B92 18012 bytes
SHA-256: e941447ab71e269744674c8d1180ad83817151614379b6f86757152e064a7ce0