Malicious PDF — malware analysis report

Static analysis result for SHA-256 313b9d5770c85a9d…

MALICIOUS

PDF

75.9 KB Created: 2021-09-12 04:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9f2ee63a915157902b83a955c1c58ed5 SHA-1: 2a0c49250af476e99d77bdcbf40c6e6b2ac90d2d SHA-256: 313b9d5770c85a9db630679b96c48dd346b931eb3bf6add8a611baa1219e8715
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicative of a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://oniceh.ru/uplcv?utm_term=launcher+iphone+x PDF link annotation
    • https://jordan.si/dokumenti/file/masurulikisofafesatoga.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/fagedato.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/zilaferakidegowuti.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb6c2116b7---67954880130.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/d48b254f8850f56286147f2ffbc0c9a0/faporabi.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/fekadoruroxi.pdfIn PDF document text
    • https://birudongker.com/contents/files/68388626876.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/tusige.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/weserisu.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/20827379413.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/87858141747.pdfIn PDF document text
    • http://strap.sk/uploads/file/mowotavikifebikijevuromu.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/ccdc316cd9a472e3c5340131e45eca45/80394755511.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/xolisutubezini.pdfIn PDF document text
    • http://www.depomatrial.com/file/ribojodupuxunigolu.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/vizeso.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/28732569773.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210912073604287.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/uuem14b685q6r4erqgd6clfl42/74601083946.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/retegobi.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a254417961---89238046168.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/85489169135.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/nepex.pdfIn PDF document text
    • http://birdwatching.sk/media/file/12870542403.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/roduj.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/remobabuzajowusadatiw.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_off0000c40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC40E 10320 bytes
SHA-256: d5bd4b27dd6fcba8de95c9e52a3dc97a25bf6ceceedbc1e72960e85d6365b350
font_01_sfnt_off0000db2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2E 18260 bytes
SHA-256: 9c714193c5387eda8cecfae96d3267985f8987f1208c636c3bf9bb0ad0a7afa5
font_02_sfnt_off00010a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.