Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf8e34d9d32c7818…

MALICIOUS

PDF

80.4 KB Created: 2021-06-13 08:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: fe217ffa41da041b99d2e10fdd79efba SHA-1: 874ab0a4cd2b521acd2e4a56317b2d90598070ce SHA-256: cf8e34d9d32c781810bcb32c62e748cf9c037df2c4fbf5be4be72b87120d21c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://allytemp.ru/uplcv?utm_term=9+practice+tests+for+the+sat+answers PDF link annotation
    • http://hylevel.net/Uploadfiles/files/65637220107.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0c2e25478---kumakis.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/99317671387.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/24000536818.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b5903f8ecd1---66444022133.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609725d3b189a---90215178506.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/43435171247.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/vekisodebotenazaku.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083578d23fe6---xolowizonobalifexijo.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/29512596910.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210613_63A491C9A6DEE2DF.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/536ca8d2eae4f98e23b577f2102e900f/bululatumiban.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/d6b51ea603f6588e5fc6f7ad12120b4d/12528303483.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/22760980546.pdfIn PDF document text
    • http://boisehighclassof1965.com/clients/879780/File/gavufupisikomoj.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/678cd49708492d11c14b9ebff325bb11/92411996014.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/518900386ca1109aa3935ed28a38ea32/55854580468.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC2 5224 bytes
SHA-256: 5a62c7511832335e91f2e901bcf59e5f85508e946153a7a1b862b7a073dde76e
font_01_sfnt_off00010d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D92 11448 bytes
SHA-256: ec9e9f2373c46b78edb1bd6ed0ab1daff8c3c72e4cef3011226e686a43952b48