Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f5a0ff6a6cf394b…

MALICIOUS

PDF

86.0 KB Created: 2021-08-16 09:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 43caefd5a76ae546e9557d3c6291c607 SHA-1: 46f6c7d7df7d64d545b518eae16f6b3f58d30761 SHA-256: 9f5a0ff6a6cf394bb1968541064871edfab224a887ffe1bdf85fa405c4b29c1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The embedded links suggest an attempt to redirect the user to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://cructi.ru/uplcv?utm_term=tecnicas+freinet+de+la+escuela+moderna+libro+pdf PDF link annotation
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160795a4030eca---75800653031.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/98565024140.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/59362218205.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a72e12ebce5---46003857160.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/83918479931.pdfIn PDF document text
    • http://s-box.biz/upload/datoteke/bufusalajulowi.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c186ee2f6be---76684690689.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/50497173044.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/2dceb817b0414259b67adb7ff8f10b39/20167804160.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/da47bc7b73fdc11ebdb32290327b7c34/590689908.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a2d998b46---58931056599.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/13861776263.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/volebalixanugapa.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/230872b72dd0543c54e196b3c22a0d7a/rimiwonakidik.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/97248052018.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a897b1d3616---punojolorejevobuzujolij.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/8307be5c70be50af4282e76e3b0b9bae/tepojudadaral.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/495a5114fbbd73be890aeb0c913f4162/83007434304.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a64c75c372---58649769137.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/devasezoximaxujemuxor.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_off0000e976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE976 10984 bytes
SHA-256: 09f5c389b2d614f4dc89ae1f6e31e43798c4c6771b0e231495ef5136b39e3cbd
font_01_sfnt_off000102bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BC 17736 bytes
SHA-256: 1d9f915428338fc3f33af4494216e0de634945b93a9762e497c95deca9100a25
font_02_sfnt_off00012fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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