Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a195691cd30f2b…

MALICIOUS

PDF

69.8 KB Created: 2021-09-29 00:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e6b595c93d7af9576923541efba3d7a5 SHA-1: 89627fb7b5279005e3f62962ddf23d529a9725c6 SHA-256: c6a195691cd30f2b92de8638d26e0a71cd8649fd090c7b98e272bcbd1ce1f8d5
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 WordPress sites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload is being distributed via these links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://krisoc.ru/uplcv?utm_term=how+do+you+get+robux+when+someone+buys+your+gamepass PDF link annotation
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/megubagafenisatorusu.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/57373122539.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/49826617426.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/152507989b93391fe0e6d500e915e1f9/wolapikadiwaki.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/zovifelobutaxotudanifazok.pdfIn PDF document text
    • https://tkbhanna.com/ckfinder/userfiles/files/wimigu.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16130d88deec0b---nipotedeluxoje.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613570c592d42---24227166289.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/maxez.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/dufixobaretitig.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/79562184000.pdfIn PDF document text
    • http://getem.eu/files/file/58714318553.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109190327507890.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/goziniguwamotilorej.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/wewixixo.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/texigi.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/65349660196.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/wozolaz.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/38238993980.pdfIn PDF document text
    • https://cathita.vn/upload/files/widenanazokafusisopanoji.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/kerekon.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/7952163548.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/172987701.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_off0000b18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB18D 11236 bytes
SHA-256: 8c2be9f293d37334b1ddc25eb84cbf97e4fa5de3bcd8d72baf24d93e709ddce6
font_01_sfnt_off0000cb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB56 14784 bytes
SHA-256: e33587e01e0a3d7b6698d6129398132498fc5b78c22c7c087d14cba08cf15dc3
font_02_sfnt_off0000f09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1