Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea77606b7ebc2a0…

MALICIOUS

PDF

88.4 KB Created: 2021-06-27 01:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 32d6aa8fa1e6192d372be35a36364e0f SHA-1: 6d0fb9e7b99c93df1983fbb14ad98bcadf3ac67d SHA-256: 8ea77606b7ebc2a05746d008ea9be3e35f93e622d089786dbad153fa37bb29f7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites using formcraft or super-forms plugins for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a link farm suggests an attempt to direct users to malicious content or exploit kits hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fd60c7872.pdf In PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094720a55a25---91264221205.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940fdc6cafd---nuvon.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/14dfd5df636e4a7f1305b44322e1836d/30381756830.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/sixet.pdfIn PDF document text
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/vezamameduwusemapiwuruvu.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/70903584501.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8d7313e8b---bevekiminivape.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/jo8r2ljfbbkeii3d0gv64oh842/sakuvorinalu.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb48848abb---47076476754.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/vadobupefej.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d25db13970---50959564922.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/megetemujajapubosemug.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/74573a947edde445d69ebcb6d2eaf016/74613368709.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/wekififoparimiwemili.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7fbf2a612---17300738361.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/soboxovawodepejalunogiv.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084287259793---47817265218.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607127d471852---podozajunekafonobefozaw.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/90950151083.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c47d7d520e9---sufabeginu.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/kenumefi.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebffc9eb5d---43236940791.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=the+real+cotton+candy+maker+instruction+manualPDF 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_off0000f4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A4 17040 bytes
SHA-256: b8521ce726a92c9aeb894b9cd0aee0430fb5324913caa36f3cc8da57e0eed675
font_01_sfnt_off0001210f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210F 10904 bytes
SHA-256: 431169f0440d1dafb52e887e85cb318ef9711afeb5cb4cfb197b59b63ac3147f
font_02_sfnt_off00013a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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