Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b3fc1ae2b499fd…

MALICIOUS

PDF

79.4 KB Created: 2021-10-06 20:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b201e98e5ede43fb010f459a9dd04bc4 SHA-1: e1bdf0a771c927748e4c62b80d0c7bb65bca3427 SHA-256: c6b3fc1ae2b499fd0562b579a74f531d5a7c1ca0a2a59848272fe5128d137ceb
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many pointing to compromised WordPress uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely serving as a lure to download further payloads or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://huntic.ru/uplcv?utm_term=how+to+add+scanned+signature+in+word PDF link annotation
    • http://ambulatorioveterinariovianello.eu/userfiles/files/pabujivozolasiworeni.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/34936268288.pdfIn PDF document text
    • https://susta.vn/userfiles/file/xadofewapumiwifisit.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/775600367.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/60309591243.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/6ql7c4rq4ip17ln2rkf6v1aj34/dirijemodukim.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/32108222929.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/begibazo.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/tijunotetixuv.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/6b7095994bf049a9d6376ab0f5700f36/nofukixixujaruwa.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/45842328144.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/timetibejatijizop.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614bbdb68c481---duduj.pdfIn PDF document text
    • http://sparkpro.lv/content/file/22863397991.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332674ca3f3---zojef.pdfIn PDF document text
    • https://ptogel2.com/contents/files/79828070713.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613679740feca---84560848290.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/fuser.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/virajasorilutu.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/92134850812.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-10-5/20211005075337727763.pdfIn PDF document text
    • 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_off0000d008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD008 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81A 18652 bytes
SHA-256: a6564a816892ab3902cd838be9add728cd9982554845fc2a30778964a27e133f
font_02_sfnt_off000117dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DD 10676 bytes
SHA-256: ffa3c43c660c99d2344eb2897268c1651bb36db771ec0e6bf2ffbe778dfd49fe

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