Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c0313a80ce2c070…

MALICIOUS

PDF

81.8 KB Created: 2021-09-04 08:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3509dabdb36ca27e84a93ed9897ed923 SHA-1: 4d5d14240de2a47a0911b70f3874557612f0b72f SHA-256: 8c0313a80ce2c070c3db48357869222962c513648116605bcdc87a5bd2359ad9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=kitchenaid+ice+maker+parts+manual PDF link annotation
    • http://ayurveda-shiatsu-nice.com/upload/files/wewolozod.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/rexojeririsikevobaf.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/petepu.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/jokigukolokixuputif.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5e9bab39d5afad485314abea89ee2972/vokawizukozixexomam.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/pokidituwatuxirisam.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/33001162794.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/3vptcq2mbf4rsnree17tg6bsvd/27346017498.pdfIn PDF document text
    • http://ceroki.com/image/files/26052989354.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/46625793018.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/nibutosugamimipo.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/gizadazerowepaxo.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e97f2a320af---45690550922.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/8ucmpot0mgd58hgklmu87fkh0n/32442548229.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d19d6843352---solafepenow.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/afd8635c869e2bfe0954e2516a25d25f/budaporo.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/84fe191998736e096993951daef555f1/76745218532.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/pagofit.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/61293388475.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/kewinujidod.pdfIn PDF document text
    • http://gerocuki.hu/user/file/36871152812.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/58029791775.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/37088262873.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/6f8e4e110190ab45a7b64c513877adaf/41453142627.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/q3of44e2462nse3ogb2tnegr2g/kajabaxok.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_off0000db97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB97 10844 bytes
SHA-256: a392623d51e688d65add3bfa21e94dad975c60f31ad1c778fe452a313df4e890
font_01_sfnt_off0000f45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45D 17468 bytes
SHA-256: 59c6bf66b85e7ea977a20adf4ffab8758526cf474895c478c2a2c21c3e124301
font_02_sfnt_off0001216b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1