Malicious PDF — malware analysis report

Static analysis result for SHA-256 0017476d5895d9d5…

MALICIOUS

PDF

81.4 KB Created: 2021-06-30 19:25:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 014696bc7ae24d6a004076a4ee3cec8c SHA-1: 8e95d5dc42648cc6e7bfccfe67adc33e0c480fcc SHA-256: 0017476d5895d9d5851283c063b041c91378a43f7c2d26b45f5a6726ed04f55c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDFs. This structure suggests a link farm designed to distribute malicious content, likely for phishing or malware delivery. The ClamAV detection and ML classifier strongly indicate malicious intent, aligning with the observed link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/705865ca6246a983d1de46435bc02295/95727143630.pdf In PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8c8f1292e---88514110435.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/9dea33f6974c3c45bc05ae115a06ac61/pojabavenirefij.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609650a6ee96e---mababosazujureso.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c6ff9eaa7---bejofoz.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/29901804594.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a140c55d6---rolobimanoxepifaw.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/65748824708.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/tiborobaf.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/38618454398.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37edfc99c1---91806677213.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4177e80b3---4596251584.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793629653a1---fajusudekobulu.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d1305ee14---puxusekoliruravezif.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/sukujuvugibatosib.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160894ca813ad0---29395150543.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/4adf17c391e7aca8751fa588501cdc52/67008386897.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/nid8hh09f4u6j3of4n4ta6v12o/jifuvisopotaku.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/92749533528.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/1f2b0a6bba6674b10a44438d099b76fd/wemoxegowiritogebiroli.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/kenevapuki.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074930ea3af7---tapemotutorokexizeli.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f94c4e5597---wasonadipifozozutivesidub.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/0v7onnmb6frls2tc43n8ccmcfa/puvufusogo.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/62b79af55f89e9104df1482eac479fe0/bejijetezuvizi.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/gaduva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=rupees+5+and+10+coins+are+now+made+ofPDF 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_off0000d782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD782 18392 bytes
SHA-256: f05cb90d8c5474bcca12786ac831fbf6c2508aceb97cc68153de9cea51d1b137
font_01_sfnt_off000105c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDB 11176 bytes
SHA-256: f33c335d4c467d204f318e1e59456f35b7b3ffdf7da69901ea04398bd3ac464f

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