Malicious PDF — malware analysis report

Static analysis result for SHA-256 473231a8250e4699…

MALICIOUS

PDF

75.1 KB Created: 2021-09-04 14:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1b0c7db8d6edd5f7e95069280dbac7fa SHA-1: 83c0546a5e03231e24baf86208548fb3ce39d194 SHA-256: 473231a8250e4699388281ef5cbb864dce560ebb410faac4affbb11a8bc6ec28
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links pointing to compromised WordPress sites, identified as a link farm on disposable hosting. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded JavaScript and compromised URLs suggest an attempt to redirect the user to a malicious site, likely for phishing or to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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 http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609680c15ff66---98301538225.pdf In PDF document text
    • http://detskypohar.cz/upload/file/bawebalipawudujukimiwukon.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/fabofoxagugofenal.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/ab0126d7a7ef79c6b60765a8a937ec84/wigupu.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/2vttgl1lagpoj6101ijhkai9e4/30473157411.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/0742b1ef8441b8ec0c842f93210e60f0/xawejowetelikebas.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/27715131757.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/fagaliwisalaf.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/55148891460.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/53781109025.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/sarewevoberi.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8q0bracth8vpbd7p4nde0q6go1/wutanatanona.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210714120251.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/36575827569.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/bupojeforiwuvona.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e76010109---betolaledobi.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/34188075874.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/rodewele.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210617141023.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/kaparuzomigogukalotix.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/71412324236.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/8bba6c7f3dd54dc40b622778f3a447a3/volivebuwarezexerefebo.pdfIn PDF document text
    • https://digireg.com/upload/jiragawadir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=hemostasia+primaria+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_off0000c3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FB 17420 bytes
SHA-256: 259c78fe780a4f683e9a8fe5b7bdb578845570766da1d7d734963db30b63ded2
font_01_sfnt_off0000ef09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF09 10500 bytes
SHA-256: 09b5fc929c49960c581cd2e092a4ac59c75ce0381456800587db2f956d4bca84
font_02_sfnt_off000106eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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