Malicious PDF — malware analysis report

Static analysis result for SHA-256 db9f66df71becb1c…

MALICIOUS

PDF

97.1 KB Created: 2021-06-25 19:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d53345ab1b5e50b98f5af5fe4c4ed03b SHA-1: 862b84bea813e71201940e83eb9b74af9d53e518 SHA-256: db9f66df71becb1c99a3cb369de2b6b09ecec15c0c991701d354d8dcf6c2d276
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves tricking users into clicking links that lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c69cb78591---49703178363.pdf In PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/2d28d966c86c6fbbf61fb2bcbca9990b/kepixibesesef.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/davagisojefamanixuraso.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/musazigejowabaf.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed68901a8b---pijanize.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16224379531248088992.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/ziwuganupoka.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d23d0b4d1---nogaxuvetunonuvidowozid.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/497385a6cfb127bab8b407148c0c910a/bixubisuxifakezularogaw.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/08c940c74dd0f249094d1a6236275d97/bagebusamasetalekux.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ce34905ea---ziwidosatozevijarunolef.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/gadimojuxewobuzizavoj.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/msr1ovsulrpfu9h9ii21gt0kkn/80987516691.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a410e1c909c---wibogojilisumijixalamaw.pdfIn PDF document text
    • http://apsons.eu/files/file/62233902876.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/23d98782e5785520272afd636e867247/benaladedoduvalidotirubep.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/tepogupadizas.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16093a6d9623be---85458370291.pdfIn PDF document text
    • http://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/pugepix.pdfIn PDF document text
    • http://mooneyes.pl/userfiles/file/dojexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=take+me+to+the+moon+rod+wavePDF 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_off000119d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D1 10412 bytes
SHA-256: c87ab9be5e8394aaf5c455d581da1e5bd7fdb1272c4a6ff4ea7d5033032ed438
font_01_sfnt_off00013146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13146 17012 bytes
SHA-256: 63b8eafbf0833d4cb79a160f358b456aa1f03dd7b9cc13832b2595f8c31f5095
font_02_sfnt_off00015de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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