Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5bc312b5d05d237…

MALICIOUS

PDF

62.3 KB Created: 2021-10-03 23:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7a0b4287e29a6e299c2362dd24de4d74 SHA-1: 13046f462978c66a464cfbd0fc4e7b288b464311 SHA-256: f5bc312b5d05d237d8dc9731f78d79fcb86f13d9b2537c5a0a6dba129fd06ae5
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The embedded JavaScript likely facilitates the redirection or download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6527

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://ketchas.ru/uplcv?utm_term=can+back+muscle+strain+cause+shortness+of+breath PDF link annotation
    • http://ccsl.asia/files/59735602777.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/3600215414.pdfIn PDF document text
    • https://greassi.com/editor_upload/file/rexikizifimakelobenakure.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ff0d9343a---fojugerivapedotajuxew.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/2abe19tungtp3rjtnnqosqkf24/vijijixuvesamelijidib.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/85094282092.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615220867ba69---75953685534.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/34820526780.pdfIn PDF document text
    • https://gangnampools.com/contents/files/temunuke.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/tovodevugenudililo.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/suwofen.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/67848426302.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/3jvbsjpu325325ta7g6hqd15v9/demujalowi.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/nitadikavoriwelutuzewa.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/34180643745.pdfIn PDF document text
    • https://dyaa.club/uploads/file/75109846202.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/diramim.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/8785bc4c1b60a2623fe234c014168292/bixeranujenisobukaxaw.pdfIn PDF document text
    • http://agilesolutions.in/uploads/likimi.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/lewira.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/94439032371.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/13774773064.pdfIn PDF document text
    • 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_off0000b06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB06C 14908 bytes
SHA-256: 153f0114df58b1bb3ff35210e212df5e1bf2a3d3aa133db09443970e51f49cef
font_01_sfnt_off0000d555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD555 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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