Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3f9655faac9bae…

MALICIOUS

PDF

72.7 KB Created: 2021-09-13 05:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 69d1d107785731e31afbe4f7e8998388 SHA-1: 28f0daaa0bfcdee3232a852fef3dda2720104a07 SHA-256: cb3f9655faac9baea25c39a0ffacda452a5cda133d3a08f2142836fba2ccdd1b
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://wisdomtours.net/upload/file/2495959467.pdf In PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/tavomasazigizamotewaxu.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613690cf6c30d---93809816605.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/jukefasesakomada.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/wuxavekutojepisumofuvuro.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/pugulufelosesokoseg.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210906085601_1520924550.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/gelidukisisopor.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/lofosujazod.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/84120118126.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c2bae2700---57179531826.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/36504013223.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/vemilugugorake.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/mebako.pdfIn PDF document text
    • http://ashokarefrigeration.com/userfiles/file/pajowalefedegedi.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/8c6b26d985c681949a440f5e95a84bdf/fanoturimizokitiwu.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/20504146025.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/peniline.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/60310304774.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb44abf857---42604208935.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/5111267438.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=thoptv+app+free+download+for+androidPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/84080421627.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_off0000ba0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA0C 10540 bytes
SHA-256: 6b78df05d7749ce4cd89a9f10f462fe3e075ee0a85623a22f63f728c5427221e
font_01_sfnt_off0000d207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD207 16828 bytes
SHA-256: e4ba406a05fed5a73bae6097cf8b8064ade1de6c71dc95ed46381c81c74867a8
font_02_sfnt_off0000fd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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