Malicious PDF — malware analysis report

Static analysis result for SHA-256 042006793c91ebd3…

MALICIOUS

PDF

66.9 KB Created: 2021-09-17 06:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8707a1449a110a9d499e61a74601a691 SHA-1: ff099806d66aa366c73b36524b16ce52c5ba4be0 SHA-256: 042006793c91ebd35d2c5a27dd1e30c01a946097c10fc40c1b804db10680ce20
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised websites, likely intended to distribute malware or facilitate phishing. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, potentially disguised as legitimate downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6525

Heuristics 5

  • 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
  • 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 http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/18689122406.pdf In PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/lizububagatujodek.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613971681a785---59863057480.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/venamawadipaki.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/92b689a1cf7aaf8c7402097456f8abf7/bomutokafobodijile.pdfIn PDF document text
    • https://auto826.vnpec.xyz/uploads/files/denufipotepidubowaz.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210911_E12A3838A30D28B6.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109150615408207.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/a5tqh6353si2fatf35puelj2fj/67801195723.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/86056488944.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210910_101829.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/86323144627.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/33809319659.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/24523085883.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/19007010751.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4cb5c1c98---12055601285.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/rutogaw.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/nisasiduxodum.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/vupov.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161313bd14a995---nefixevuzinijirelajovev.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/16958591158.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/vajeremugida.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/49739742385.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/16985064715.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/fomiwafimakajada.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=download+game+billiard+apkPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB2D 21600 bytes
SHA-256: 7eb20fc78a11561f644c587f2017c95369854e95677712b7ec71b53b34881a56
font_01_sfnt_off0000f0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A5 10788 bytes
SHA-256: b2915321781c593e626956472795588d176beed5dbabe4f54e7313eaef9dea64