Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf271a1e3b5dd17c…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 05:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b017f442279f8e5bc12adab2d613b394 SHA-1: c4f6db69417a4f1b49c5ce23f7723d1bcdeca14f SHA-256: cf271a1e3b5dd17c6e686e6b11a4f1f5551f2eced9a8fffc32bf2a3b9b6ae9cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous 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 through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://crysiq.ru/uplcv?utm_term=dc+pandey+physics+for+neet+pdf+free+download PDF link annotation
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/nfn2v95e6um3569dkujeqc03rt/4035981727.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071c4b778ca0---33968355896.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/tt1rdl9ma7jkahl9rm2e6o343c/pesusemajovegelusilap.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/tiwusuzawok.pdfIn PDF document text
    • http://bgindus.com/t/tutorfirm/uploads/ck/files/senalene.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/68243245846.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210615215557_08vj4f.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b522528cab2---wutukofib.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/gomuvubo.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/60831294378.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/94550977329.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/96980401336.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/71001986696.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/jujidopov.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/koruxisafimebofifuxiv.pdfIn PDF document text
    • http://world-system-packet.com/userfiles/file/81767724244.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/busurolekefozenop.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160927fbc9a1dd---fovadelonoxom.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16070e6e506444---65940702037.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161264fec83cb6---xogusilu.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/58307719217.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/e8b67b8ca6741c632561bc1541de3eb8/9870435057.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_off0000df15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF15 10916 bytes
SHA-256: 8ca65f44df3c6abeb46a8ff22eb7876c850a75ff1f1c58d7eea41676f8047670
font_01_sfnt_off0000f866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF866 18424 bytes
SHA-256: 3b07934c2d53f55204ecb3f1d666423b120560bb03ea432534fc33127412f36b
font_02_sfnt_off00012825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12825 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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