Malicious PDF — malware analysis report

Static analysis result for SHA-256 43be34be1590c1c3…

MALICIOUS

PDF

83.1 KB Created: 2021-08-02 02:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f01d0168c54332921c55315c5cafcd55 SHA-1: cc8ac08512eb7eb9988fcee9cd461a1a04044de8 SHA-256: 43be34be1590c1c36ad38c5ffc86f5ae69ecd03cebee466b818ba9fa0af0e674
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing and trojan threat. It employs a link farm strategy, directing users to compromised WordPress sites hosting further malicious PDFs, likely as part of a phishing or malware distribution campaign. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of invoice/payment language and download button lures suggests a financial scam or a deceptive download prompt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ca17c043e---21713886575.pdf In PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/refiriwasat.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/9afos15e5o8fp85iaoo9nvm4au/baxomibemovijowon.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160adbb87b1fef---vepareziludelo.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/21314314790.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/bcf188a8d6da020be9808124e203cd47/lotirizubawexojavopivos.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/77848561832.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/30261039646.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094b40160e31---nonelaxizunufutaji.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/78034052474.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/wiparenewepira.pdfIn PDF document text
    • https://aedwea.com/upload/foto/vowujotalub.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/6126536685.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/rn9bc2p55l7uuepk0dhd69tqcs/11417389460.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a49716696c8---redoxol.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/76667485152.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/rekefunu.pdfIn PDF document text
    • http://saxonsaxtonfamilyreunion.com/clients/f/f6/f6d0431f970e0833b0867c311dafb132/File/90898961984.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210712221359_18310287.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/d797e27d53b9f7ba9ed2d4c7b1951a49/89360374429.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/roxuvorazolodugim.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/jepejepuwoziro.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/bewipaximavofaw.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/c360f6b4aea2fde119523a7bacc220a4/39098131419.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/1cb8830ae3168f53822b114d77a9581b/tapaxokorewajasafifawejap.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/73ghehj1qij7je5f0cl7860rd3/47650431735.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/44710175677.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=cheque+requisition+form+template+excelPDF 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_off0000de56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE56 17240 bytes
SHA-256: 486a0319aa8907651af14968fa5280f1e39ecfadc55d213b1da1d40aea5d12db
font_01_sfnt_off00010b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B64 11124 bytes
SHA-256: f99d7f57b9c88402d345d74411466d4a0885a2483138cd2287119da472c4c28f
font_02_sfnt_off00012537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12537 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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