Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f08b6ab5ff854a…

MALICIOUS

PDF

75.3 KB Created: 2021-09-10 01:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b2b66ecb3aa6effc087cbe87145f4fb4 SHA-1: e4e7ed179b735fcac6752b21a698026e661ca054 SHA-256: b1f08b6ab5ff854a87c96b0403506127b9006c146f8c97bd2c9efce04974dc42
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload directories and disposable hosting. These links are likely intended to redirect the user to download malicious payloads, as indicated by the ClamAV detection of 'Pdf.Phishing.Trojan'. The presence of embedded JavaScript further supports the execution of malicious code within the document.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/36180875.pdf In PDF document text
    • http://sipzip.com/userfiles/file/80140749812.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136af6391fe2---69269047742.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356b03737a5---xosifolabamuginevorived.pdfIn PDF document text
    • http://yanartextil.com/firma/files/razopijefovu.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/wimiwivitibivofopudofe.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/94658037094.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/56882839238.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/49360915036.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/latopuwiwizoromabunuwud.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/ratobixivaladuv.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/qai56ovpj1rk5sf669h7q2pj8b/27506928233.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1630942353274792041.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/51019158320.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/dudozijagerovelofadasi.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/23692216600.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/61078552356.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/bemelu.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/h9umnempaktei8oj1oun0tm7de/73147586990.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/84580554627.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/nelogomexabinix.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/19735662955.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139a4295c07b---zezumezukevovimaf.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/62699046379.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/30954598272.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=download+pubg+latest+versionPDF 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_off0000dc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC30 17648 bytes
SHA-256: 0ca75bccf2cf66555b057f803a7b728488905b3a499dc2853d234efa33da07c2
font_01_sfnt_off000109ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1