Malicious PDF — malware analysis report

Static analysis result for SHA-256 f274239fafaab801…

MALICIOUS

PDF

72.2 KB Created: 2021-09-11 16:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3e819f7f010633f15fa992a59964bc64 SHA-1: d6068bed2ed80cf6447398712251be05ebd73faa SHA-256: f274239fafaab801782e6e153bb9d2be9fa0dd1e9e6fbe42e45a14dc91abc7a1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to potentially compromised or disposable hosting sites, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a secondary payload or phish credentials. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pokemom2.com/uploads/files/82989429514.pdf In PDF document text
    • https://pisangmanis.com/contents/files/82361472815.pdfIn PDF document text
    • http://mopron.ru/upload/files/gupuvuma.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/pitagorok.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/30048847580.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/pibedidalomubomuv.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/22d12af374cdf628c7e7cddfca362908/gipexexojemigolo.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/4229638040.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/sanixiwevolupofukeg.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/86673176993.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/nidatuvetewu.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/pewawovagev.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/10678426538.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/30271769742.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec07c9d68a---zupakasujo.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/20537569751.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fea09f319d---lafafekekefokewadugibelo.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/6d383caf5fea23a27d6b4ba650e2418e/wixisabuwasutanaz.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c2e189f6c---nafafodesoniju.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/taxekofakifelopuxoja.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/feleruk.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/48035994420.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/91338626937.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16132f7011f8d4---turegawexu.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/gifebixapidetumolon.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/zapotadalavepepinizesem.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/7895513462.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=android+background+animation+effectsPDF 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_off0000b919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB919 15720 bytes
SHA-256: fe55bbd0dd7262ed25b4b53594b986c7da5dd35c721532f01b6e2159331dd40b
font_01_sfnt_off0000e13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13A 11084 bytes
SHA-256: c8bc27ae1e736e1dbe3eadeeb86c89431e01b3ecbde2b070f6e6ac0157250e33
font_02_sfnt_off0000faee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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