Malicious PDF — malware analysis report

Static analysis result for SHA-256 71dbee5e4284f53e…

MALICIOUS

PDF

75.0 KB Created: 2021-09-01 12:42:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 366c23f46dfda975d7f34d68d5595a64 SHA-1: 48a19f38fc7459b396c31e0f4e65d762faefa493 SHA-256: 71dbee5e4284f53e1b904b6c8ac54b0b4b10cd06c499e505f02277d53622a3d6
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://stpeterscbs.ca/ckfinder/userfiles/files/fogevunijod.pdf In PDF document text
    • https://candbco.com/ckfinder/userfiles/files/90237920227.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076af61bbb22---davib.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/kurepupolotaxuvafe.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fc631c86f6---sovixokixisamolevuvun.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/48439659408.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/80f48fe4292c6ff063cb0c69f624dd3b/nokigujebawurumoxezatuli.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///gopanewiwofijifawunuvu.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/j4gqa9g428dcpfjrc791i574s2/dubogonotul.pdfIn PDF document text
    • https://cochleartudaskozpont.hufiles/39875325796.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/28680162097.pdfIn PDF document text
    • http://www.moyekolodin.com/files/ranoworenisisifuza.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/vevup.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/doxojanobez.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/6593176181.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e59c412f3---17611461059.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/9079835050.pdfIn PDF document text
    • http://citranco.com/users/files/72721135902.pdfIn PDF document text
    • https://songhongresort.com/img/files/42913608884.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/35urion55ep6bll7dk7bn5okl0/74894624232.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/66571028218.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807cec30d56---62492302056.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/0cfd321830489b8fd97f2dde41dc6256/56697103695.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/62901644950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=1000+solved+problems+in+classical+physics+pdf+free+downloadPDF 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_off0000c1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1AC 11272 bytes
SHA-256: c3c79874daed3017ba191703c26f111781d7cf6fd0cafa2fca373f54832c99ab
font_01_sfnt_off0000dbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB5 16136 bytes
SHA-256: 577956f04f876fc0fd039dd6729db736e730f50c29c45160cdd0da505364e858
font_02_sfnt_off00010506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10506 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1