Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f2cd72242483ae7…

MALICIOUS

PDF

82.7 KB Created: 2021-09-07 05:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 22cf0c72b74e75e2776601ef17b57850 SHA-1: 110222df9723e15e348aa86f133953f6c67fdf84 SHA-256: 8f2cd72242483ae75034a54a2788a0c1a03fe410d4d318b3edf835326411b290
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised websites and disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to malicious content or phishing sites, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/3240140616.pdf In PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608285fb21c06---wisesexejeporuten.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/dfojhhh2l1qf7amgik447snf97/91801747900.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceb8a205dc---44800303989.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609e02ee0c12e---bekevedavukepebibe.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/73007459852.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/765ffc3e50d158b129baa919e483aeb5/15665055892.pdfIn PDF document text
    • http://vitrine-prof.com/files/tasivakefoguxi.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/qtogq2c386dr7bm3f03ogn77e7/81501457087.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/54991425299.pdfIn PDF document text
    • https://kopari.hu/files/file/51695594368.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/6006244457.pdfIn PDF document text
    • https://rotherelectric.com/files/degirevovepoponiwuraz.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/kiniliperufewarejagexu.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3117016778ca3590a0e3cc7c138ef4d8/migagigujasajegezaluwus.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e170a32a645---momenamedimopid.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/lawikupewidezen.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/sumemesivegaget.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/57103333138.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/kukokutu.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/73837980071.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/a480de2f4acdf977052837f608195102/wubububu.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/kukiluvanesixavuv.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/xafomixizopovezuzixojaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=modelos+de+introduccion+de+una+monografia+pdfPDF 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_off0000da7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF296 11056 bytes
SHA-256: ea97f9bb48fd4f71674f2de52cc30b5deb881d2f65ef682a0b7beb4e5aefb19c
font_02_sfnt_off00010c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1D 18480 bytes
SHA-256: cb8d695762b74ca3421161b34d2d28e94949920080cdb023c40d43f591f61063