Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2b28ae7ac762628…

MALICIOUS

PDF

89.4 KB Created: 2021-09-13 09:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 58c93ca76935fd4325eade0304d4cc43 SHA-1: bda43809908f2b7463e97e4e90659c2237592792 SHA-256: b2b28ae7ac762628f74258ed02c3a6ecdd684b35cec4b129db8485c2a48f7588
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. It also features a link farm pointing to various domains, many of which host PDF files, suggesting a coordinated effort to distribute malicious content or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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
  • 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://raiporjai.com/piceditor/file/47438708943.pdf In PDF document text
    • https://derechosenred.org/aym_image/files/76009353476.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/83480054586.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/70900337511.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210902055001.pdfIn PDF document text
    • http://fabtur.ru/upload/files/58833303496.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/13510832583.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/fegigowif.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/27409146697.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/89777324646.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/kosavojolubolezajebo.pdfIn PDF document text
    • http://ojazzdance.fr/userfiles/file/81324061001.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136cf2b3404a---pisojuve.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/xebixariwo.pdfIn PDF document text
    • http://master-vin.ru/files/file/88902131074.pdfIn PDF document text
    • https://aqualibramontois.be/fckdownload/file/nikuza.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1c6212c74---wumejubuvisazusifonara.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/48036533652.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/40220722204.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b1b8a585f---61651491828.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109120024176499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=bridge+to+terabithia+by+katherine+paterson+pdfPDF link annotation
    • 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_off0000f69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69D 11128 bytes
SHA-256: 25e2d60cb0f441e495de04394d745e0302e43ade051391a40339dfc9b51dc3f4
font_01_sfnt_off0001102b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001283d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283D 18472 bytes
SHA-256: 2009b1970b413b7734b79a480d309b2d2150c8bbfdb8f443d637655f05c78f95