Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d7caf8a9cf5a9d3…

MALICIOUS

PDF

131.3 KB Created: 2021-08-22 04:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9c992f10f4452d0c1e7ce508de60b847 SHA-1: 380eb8ba5a0c50307e14df7b57269f01ac5f2e49 SHA-256: 3d7caf8a9cf5a9d3c22ad84be04804b3649e3137aa6871065e9d36d845f457c9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The presence of a raw IP address in one of the URIs and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55890f0042---kurumigososozu.pdf In PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/ludap.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/wurikuvabiwapovud.pdfPDF link annotation
    • https://sankaibearing.com/userfiles/files/zuzelumovizeli.pdfIn PDF document text
    • http://mramus.com/fck/imagesfile/taxonurodazimovuj.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c86ed87a0a6---gigidozolaze.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/kegogejororijo.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077041a97fc6---24573878960.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/xukonexoxosuda.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a1204dd3b---josunixigigaj.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/ec4812c15492c065a12ef1c1e9ee3c3d/22408005466.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/lexigu.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/h8m2g1r08uqo8u8rq7a3a4aidg/wimonezevaseruwi.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/nidizerodivugud.pdfIn PDF document text
    • http://ks-puyuma.com/CKEdit/upload/files/vodalinutivavurirogajaru.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/35505050761.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c09bf4a387---44700703916.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/getomimodupomexizopomenu.pdfIn PDF document text
    • http://stavbyhes.cz/ckfinder/userfiles/files/vuberezawowejuvar.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/bidekileluvifuxosege.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788bc0604c5---10213958612.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/jimedarewubobetewafexe.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/tuxejalopik.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e9ea684cd---79418638038.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/lilakumunemominadegujis.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/74367068926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=braunwald.+tratado+de+cardiolog%C3%ADa+%2B+expertconsult+texto+de+medicina+cardiovascular+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_off0001980a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1980A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B01C 18804 bytes
SHA-256: 32316290ba4e9531428bbd3f11ae30b4fffd1431b3dc5508056b5b9802a7fee7
font_02_sfnt_off0001dee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DEE5 11500 bytes
SHA-256: e94ac6078f66b7397b6a45bd3710f77390bb4946e3fca06e2620c434b246b87a

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