Malicious PDF — malware analysis report

Static analysis result for SHA-256 52c2166b2cb54b85…

MALICIOUS

PDF

91.5 KB Created: 2021-08-10 14:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c1a8789d6df4ed7e6027038e284e8780 SHA-1: 8a3f2188f54f7e620379b7166c874736401231f5 SHA-256: 52c2166b2cb54b85f78e6d665a945110a28149360549d6a6a90e2aa3c371987d
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of links pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or redirect users. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 https://fanaf.com/article_ressources/file/rijiduw.pdf In PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/fe580322f0a5967d534b7ea77aa2ad73/14340706755.pdfIn PDF document text
    • https://ckmandarin.com/uploads/buvojomewibulezoro.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/61255091636.pdfIn PDF document text
    • https://loctra.net/userfiles/file/sodesolo.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c89d3b7439---36064573973.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a359b55110d---78711447928.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746ab22dcdb---65054837991.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16070e07578b6f---pebekozosuxapokebumubuw.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edd8d89ca88---21109706022.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/farizorerowadapirino.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/tenobaja.pdfIn PDF document text
    • http://teresachild.com/upload/files/30591852427.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2d5b567f3---19175699903.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/76269980741.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e5d44314564---87252693784.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210802233551_grkvat.pdfIn PDF document text
    • http://envigest.cz/upload/file/naluzivomafirogu.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081d440c9b20---21911531217.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa68a3cf978---laxiluxubilisoxidemu.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/89179a5cc05afb3ba557055111d28a9f/42744626786.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/levutoxozizegisobore.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/31311538722.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a66a6c8e0cc---15029262519.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad3141f62a---19035906593.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6d109df1c9f6c452916495fda76f7af5/pajimexevanovikisa.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/8dc57800626f1e7a6bc20c4378d51e77/92790686432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=cronicas+de+narnia+libro+1PDF 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_off00010303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10303 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B15 17348 bytes
SHA-256: d2866ccbd4954669215a09ea92e37657b3c933e42defa671c065d088b8903d75
font_02_sfnt_off0001470d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1470D 10488 bytes
SHA-256: 2caad326798785088730b61ad852dc135d63a3b081bd6a148820cdecea5988fe

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