Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e303fb0442e32c4…

MALICIOUS

PDF

81.2 KB Created: 2021-09-02 00:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ade9e807e5bb9e2f99421a8c469f3d6d SHA-1: ccef32e1070eaf6debe2c5f0bebf712441f92396 SHA-256: 4e303fb0442e32c40a967c2212348d83ef2f34c48af529b33faca7ac1fba6e16
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various domains, including compromised CMS upload directories. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://goldenbaycruisesagent.com/userfiles/file/giwegeniba.pdf In PDF document text
    • http://csc0535.com/userfiles/file/20210714071251_yh6798.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tabozupokoxupiresomut.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/5477706741.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/mituxiki.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160baa7e55ce92---39173422306.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160850f8fb709d---kibumonukuz.pdfIn PDF document text
    • https://peterdegendt.be/file/givusenanere.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/zavalep.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/60245855729.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/uht8d4qf0umer60b1c6eb8glu9/bukopofegirubejuredafinoj.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/71830151567.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/gudalotunerexojujixatawe.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/fodogibogezojubofele.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb86df2122---labefigon.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021062101033773499.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/nigamavexusubitet.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/65423054459.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/e53jpc4fnhurvao0aj986mk205/38317038831.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/91514190073.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/kebewapudojobakobevaga.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/kinel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=pokemon+white+2+ds+rom+downloadPDF 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_off0000d5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A3 10812 bytes
SHA-256: a39708c337d09b1fee0a161b7664a685dd36045002845cc58b12499ad387985f
font_01_sfnt_off0000ee7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7F 18276 bytes
SHA-256: ea8589939b29d04e767ced787ec561a06d531b29ebd75049126aae94a8bf0b02
font_02_sfnt_off00011df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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