Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd02df7cd492004…

MALICIOUS

PDF

68.9 KB Created: 2021-09-19 03:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2d50d0c2cd6788ed3b5b9f327b7766b8 SHA-1: f32942797689a9df4ce48f1caa9cf604e7662241 SHA-256: afd02df7cd492004b95827d5d45c4badacfdf145b60a109c93454e14035815d3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to multiple disposable hosts and compromised CMS upload storage. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pistant.ru/uplcv?utm_term=tubemate+2021+latest PDF link annotation
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139cd36ec992---17332981874.pdfIn PDF document text
    • http://pk.mo/userfiles/file/kabexawaputitewowerimet.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/tivudarazesexapakigebuzo.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/41985694890.pdfIn PDF document text
    • https://supremeroi.com/FCKeditor/file/75925738352.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/xenibubejijasenakunuki.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/67435952958.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/nolaforul.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/r9o0pk6vninkuot1cuk3b6q9os/kolepefezuxatogubasixiniw.pdfIn PDF document text
    • https://5uempat.com/contents/files/49400637753.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/77567361677.pdfIn PDF document text
    • http://cascad-trans.ru/files/5946370229.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/togawesutanofepafibazuxu.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/72601175291.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/19467767507.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/42992844357.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16133886ecde56---mukisur.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/gagupufili.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_off0000ae9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE9F 10352 bytes
SHA-256: 7cdfdb74d16af61dcc9bbcc1c33f5fe65bba9a3644fd5877637f4c21667d01a7
font_01_sfnt_off0000c631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC631 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE43 15844 bytes
SHA-256: 3d0da6b2d3bea987456a530ff7ce55bfec4adf46b08dbfeb3b9a7c822fa4fbc1

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