Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8ef943285cfcb5…

MALICIOUS

PDF

108.9 KB Created: 2021-07-19 23:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 43ee912f740625aaae880abebe80cf17 SHA-1: 74af77c437910c9ca257506aefc9252c159288e2 SHA-256: 2d8ef943285cfcb5d0fec9a0c1701a26d4baaaadb32649cb1fdf975103ad2eb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate maliciousness. The file's structure suggests it's designed to act as a link farm, likely to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • 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.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160837f986051e---46030429829.pdf In PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096343e616f5---nekixipe.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/lnprscuiu4ddot5engknt2l5uq/tidagi.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210529050438.pdfIn PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/20987085826.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/44743676290.pdfIn PDF document text
    • https://advik.net/userfiles/file/xojubitegefebivusilinow.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c27561526e---kijawasuxewuw.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a167aadc730---sudatepinine.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/4602a10c257c7f04d8e16677d2933fbb/zugalelisirozilerapuneni.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821a279ce4a---gozixijebawawo.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/30789504372.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/76822563364.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f548374557---7851753928.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/22544565615.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/f1d5775735705bfbac187b1ba5bc4e19/juwisuginezitudaxarokuwud.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/98610448067.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/bixogesosejujijabebu.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e5ee7f1fc---12404128452.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608332609c76d---zajukagejonixazuda.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/13607344137.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0c55a25b8---73933394702.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f49df51346c---goruvisusuvotopubur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=he+that+believeth+on+mePDF 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_off00014afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16314 10304 bytes
SHA-256: 7047475fad1462a9128c518782548ca2c12c86c227a0dc127fd08c9ba07da075
font_02_sfnt_off00017a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A05 17016 bytes
SHA-256: 6180a43b160250b0a1ab8cc5d7e7657f2975262f4316f84fde9a0975b7dafee0

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