Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b67b9534161e4b…

MALICIOUS

PDF

99.7 KB Created: 2021-06-30 17:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 55867e18117817e8de70b9cb4be747dc SHA-1: f7c681f7afae70236ef74544a3e3cc928a515c9c SHA-256: 72b67b9534161e4bc652f6e14866522cf1baed2b70e8824be2e288ce2ae2f4a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://bravo-hk.com/userfiles/file/sixovuwowomusa.pdf
    • http://ritadas.in/userfiles/file/69610973328.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/n709tgeq3909i6jh8uo4k3q565/77504110001.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16089a02c72cf4---napiv.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0139b1822---gawonoxozazuwu.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1a1d93ff---vibebuluseroxefotebujeju.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/f15a4ce4f23df3adfbc9be09c4bd089d/xosalorefap.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/abfc9b528a6763633c093cb008805591/jijibujafaxit.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/6a52d076ae22ebe9e45856b2cdd6e1bf/luxobovuzej.pdf
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/ninunu.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/5n8ct55cdihbh7ql1nfs91b5f7/zoweduxakugapage.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3c950fb23b71fc1b93471dac90a3f7a8/11016444919.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780335122b4---tugimavop.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd1ddb484c---42339015231.pdf
    • https://senfina.top/uploads/files/72595420858.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096b7af7b0ba---34304880800.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/67fc80df9ac146903c0e9b96419e5b9c/pizomapaxulolopogofekob.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bb0eb42c6---nugopizumufu.pdf
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/20131960570.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/ba711de2bbf37840e2020c64d4c81fa5/kunutesuvobip.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094b01736259---21323584837.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c89bf9750dd---jejapugolu.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609843f21506c---nemekafavezatukaliwasumo.pdf
    • http://afghansolar.com/userfiles/file/pudogimikuvup.pdf
    • https://cmsschoolkg.org/userfiles/file/51073690260.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=my+house+paragraph+100+words
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e5a.bin
b2454de05f8db3897a852b6660dbf37cbbee1b452381bc0c4b699f8bed333ac8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5A 19544 bytes
font_01_sfnt_off00015073.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15073 16792 bytes
font_02_sfnt_off0001688a.bin
c94ca2f6ae230c0c6ff653ce9f56f1f646ac8f25f18d0f4287ef3210cebd8efd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1688A 10796 bytes

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