Malicious PDF — malware analysis report

Static analysis result for SHA-256 a837b15d88636401…

MALICIOUS

PDF

101.0 KB Created: 2021-09-13 11:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7f2d5941109a4ba323f643fb5a3fa19b SHA-1: 8ef2ca3c48f9ab311dfb26725b02d25b9f7a9a34 SHA-256: a837b15d886364016dc4b5f8631a0ead7d1f8b320d45d6d41d5570d86bf29fca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns align with common techniques for luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://pnlcoach.com/misc2/file/ In PDF document text
    • http://resheto.ru/users_images/fck/file/xomosanabe.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1a6a95f88---67424609007.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/8525224336.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/77789387283.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130b010ef937---mazazet.pdfIn PDF document text
    • http://kammed.com/userfiles/file/53809248959.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/kirudesipojutoju.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/3965143744.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/81214315186.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/96849992618.pdfIn PDF document text
    • http://xycrusher.com/d/files/64653570980.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/81702475402.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/14671798395.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/posigokoni.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/13477250045.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/r7mhd84hnst7jg89fipf1sqj0e/jukovufibinujijafofele.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/7dqkcl0bsb3d6pvav1c8q69o1e/92134110596.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/godugemi.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/37992518807.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210909230917.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130af2e4428d---64276562121.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/zazarinuvagokej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=snapdragon+720g+chipset+pricePDF 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_off000122a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABB 11112 bytes
SHA-256: 0e911963a4772d6356a0512856652e7e544c3bd3590a374c82022fb9f76610aa
font_02_sfnt_off0001546e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1546E 19388 bytes
SHA-256: 467119f73654695e700f5dad31e7ae8e7fef5f0f31684af1dbffe935a5968c1d

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