Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf8b6cf7102f99a…

MALICIOUS

PDF

82.4 KB Created: 2021-09-28 06:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 08d4192e706edeea27ae4f2aa7476a60 SHA-1: 68ac5b67bcc8489198bef5855a9d0ebbf6759922 SHA-256: 3cf8b6cf7102f99afb87f3c8da524e8c731544177cd259cd6414d9c8e55cd1f4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous external links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://laborke.ru/uplcv?utm_term=textov%C3%BD+editor+pro+android PDF link annotation
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/456a6c7d87b26016e94c03afd25aa74e/luruvaw.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c8d9c6ce9---fumax.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/pobonamesuda.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/samowul.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/kagatopufuvibagenuvi.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/degimotevopifijajebibezis.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/supawogifibedixetijowe.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/45579299120.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/82990263858.pdfIn PDF document text
    • https://btegypt.com/file/4005557844.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615099a2dcd24---jewekodunefomape.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/76764949993.pdfIn PDF document text
    • http://micdelhi.in/userfiles/file/xarewivol.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/15263774476.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/95238246706.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/19555994881.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a3c9c3d54f---70893583805.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/89158062596.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/16173573357.pdfIn PDF document text
    • https://fond.ru/userfiles/file/nuzidakifimaxupirotovag.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/zizevajovumeveval.pdfIn PDF document text
    • http://bidadapatidar.com/userfiles/file/47261512018.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/nanuzunixo.pdfIn PDF document text
    • 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_off0000d06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06F 22644 bytes
SHA-256: fe2e98c20a11176e9efbf03a352d66021ca8e073168d06267493b0aa3fe56ac2
font_01_sfnt_off00010a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A82 10432 bytes
SHA-256: a364f03789dcd2cc60c0b10723ee6deca63d782e632c309adf43a4cf3d6eef6f
font_02_sfnt_off0001224c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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