Malicious PDF — malware analysis report

Static analysis result for SHA-256 6236cd53bf92f631…

MALICIOUS

PDF

72.4 KB Created: 2021-09-25 22:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b4f787203fe44ed97255bb6d90fe3c54 SHA-1: e10938567595da1116f89ef6977893855fbc4866 SHA-256: 6236cd53bf92f631ec32c983f68775b04f62af60ba11e584bc46c6dd916eb548
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file functions as a link farm, directing users to various external URLs, some hosted on compromised WordPress sites. The presence of numerous links, including one with a 'utm_term' parameter suggesting tracking, indicates an attempt to lure users to potentially malicious destinations for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://crysiq.ru/uplcv?utm_term=how+to+check+own+wifi+password+in+mobile PDF link annotation
    • http://bckbytow.naszbip.pl/img/upload/files/kopalasukadolusenagez.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/wazerasebija.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cb19b10838---wanajofefowo.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/161338b0cb0cbd---61087868185.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/fugawu.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/jewefu.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/92607245161.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/58905205353.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2c9a5c4da833993e0449598261f19ef1/runibujomo.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/17108893899.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090917511773499.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/jumevop.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/xoroz.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/moq9f28cpiko2v1tnot1j6e6om/nazenozotatetewi.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/futifozapurefewed.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613537795bb5a---bifipotunafikabenoror.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/kasezegutovomaxijotul.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/zovumesujodoxulowuda.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16142aa8d20300---rewididetidarisidejujake.pdfIn PDF document text
    • http://rld-carbon.com/file/11956082288.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/77052065719.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/67624621876.pdfIn PDF document text
    • http://www.bash.cl/media/file/rikiwexemevalajidopafozax.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_off0000b657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB657 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6E 11192 bytes
SHA-256: 17043e0e5b6cfa890f8bf6b06903afcd4b664c3e01c2a5c623577189a8102a7c
font_02_sfnt_off0000e831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE831 16948 bytes
SHA-256: fdfa71a8c4e77f78b60f85f138879af31d2202c652ceaff56ed68bcc2b9a49a3

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