Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c0f78ac6b4e40c5…

MALICIOUS

PDF

84.8 KB Created: 2021-09-21 00:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d45a6e42e7ebf56d95fa0948819159c1 SHA-1: 174bad85ed81e02bdd7baa1feccf29c9b41c8a41 SHA-256: 0c0f78ac6b4e40c506df127f3c3b03f2025b44bccd097bb4c55038b097f0e6f6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. The presence of multiple links pointing to compromised WordPress upload directories and disposable hosting suggests a phishing or malware distribution scheme. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a lure to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://inter-travel.hu/_user/file/45170751242.pdf In PDF document text
    • https://fallsplat.se/bildbank/file/pejuzekerixoxipimanefusit.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341a703e236---13641664955.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/64b9f4b544ccb898a3cae61c8e992406/91378844879.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/medotu.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/29006494222.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/gufarisevinubikuvapemup.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/sisotomosuputejazenivemor.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/88843300757.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/5489346348.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1631691918.pdfIn PDF document text
    • https://mycultureis.com/FileData/ckfinder/files/20210921_295B794604987872.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/lorup.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fccec5ce84---resok.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/retuj.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/19585173610.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/fatujuvusov.pdfIn PDF document text
    • http://dakov.hu/_user/file/11756588022.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/wanije.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/zabufuzubemobunotonoda.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/gotafod.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210917_130034.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/ravufunevosowumoxifutozig.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/95892187726.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=download+apk+pubg+terbaru+2020+no+obbPDF 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_off0000e3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C3 18640 bytes
SHA-256: 104ef9e32a5ed923141d46537a24b757e1a6e9db6d8809fbc1a9b5439a55cada
font_01_sfnt_off00011439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11439 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C50 10968 bytes
SHA-256: aec777ff81b42e4e57b3581b7e2ff1b74b4325460b7b31691292e79953ddc53a

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