Malicious PDF — malware analysis report

Static analysis result for SHA-256 501dd0321fe304ee…

MALICIOUS

PDF

79.1 KB Created: 2021-09-07 02:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d5bfdbae0d16c79fd136e482eee7c550 SHA-1: 89b389f7cb43929c6c1f633fc46e8a9b5c909a2d SHA-256: 501dd0321fe304eeab14b6dbd7609e64e3709bbcd0be66aecc9d7c61b04f5906
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by an ML classifier. It contains a link farm pointing to multiple compromised websites, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of multiple distinct hosts and the use of compromised CMS upload directories indicate a coordinated effort to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/p0um14teq0pus6o59lf8sl0ds3/buvor.pdf In PDF document text
    • http://drivingschool-brno.eu/files/defudalofojit.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4fecdf055---jidekos.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/90747993448.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f11556151ee---xemelepugizivukewo.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/diwiwamum.pdfIn PDF document text
    • http://wedding-ideas.ru/ckfinder/userfiles/files/19723857387.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e71651bb22---lilovowaliw.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/cf4bb51c27a35e4a94637cf604987625/tanaxajetelipup.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca78641b86---93025228586.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081eac1b5990---fimupedimezozifesebuzivib.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/tebumabik.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/19758808173.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/wixelulam.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c944988f8a---luwetevobi.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/xukosaxugezimoke.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/7f5b0592e1d22863cd737fccfaca4ad1/bixagikumiw.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/kasalawavapinofime.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/25657797491.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ddbcc15f810---57241447870.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/gudidapepiwij.pdfIn PDF document text
    • https://wita.lt/images/files/12325835907.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/81387498820.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae9ff66f29---dabisezewemataterutano.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/42894499907.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=verb+to+be+countries+and+nationalities+exercises+pdfPDF 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_off0000cb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34C 10924 bytes
SHA-256: 3351ec5dd8c944c45fcb1ab40ad30ea09f7883c816f51b7ba870eb3c3faf19b5
font_02_sfnt_off0000fc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC88 18520 bytes
SHA-256: e91d9572cb50316414d6510d2c249feea648128a8de9fdb361f0844c77256f3c

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