Malicious PDF — malware analysis report

Static analysis result for SHA-256 8017073f0e294d40…

MALICIOUS

PDF

83.0 KB Created: 2021-09-04 23:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1ce21b6ff021f936b3ca7c365d29525 SHA-1: 3822739023e3cf3f00eecdb3ef7f2e253c5d954d SHA-256: 8017073f0e294d404320f52c1a94e9b2751f05bb936fea00d09ee368bd609b78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to various websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://candleelectricals.com/uploaded_files/userfiles/files/94242139292.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/59f1790428ce08569f62b25b47152e77/xodowogowetefisizetove.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094bb5a9ba6d---68912156872.pdf
    • http://paillasse.hu/userfiles/file/53354091011.pdf
    • https://limpiezasinasel.com/userfiles/files/nifokepaxulipe.pdf
    • http://rentaruedas.com/files/others/savaxapakidavi.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/8b57209ef0327281263975a9adc4d577/90690908754.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737c9ee9ec1---jobobuvipexadafot.pdf
    • https://bomberosdenavarra.com/userfiles_nexo/files/23831065691.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e6bea490039---32333098700.pdf
    • http://aven.su/userfiles/file/jasizumewan.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160910c9ed4f25---69338581917.pdf
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/ginukajevimipesawed.pdf
    • http://sudeoksa.net/userfiles/file/20210830162151.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608974a71be27---80302625398.pdf
    • https://autosaloncenter.com/uploads/file/nezebolub.pdf
    • https://pbchistoryonline.org/uploads/file/2532284343.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/80a7da5ab83f099f7bf3453b47931d13/zuneno.pdf
    • https://doanhnghiepvietnam.org/img_duhoc/files/zupefuboleb.pdf
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/34777995906.pdf
    • https://bangvetthuong.com/luutru/files/xonenoxarojedopewa.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/c72afb4840d37aa935cd1adaaf5bb921/40757618744.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d9c77fe03---80629881635.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=combine+pdf+into+one+file+adobe+reader
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D5 16792 bytes
font_01_sfnt_off0000f8ec.bin
07e4d054b5480d734927e7ebef37ebd4f6807ea114a24a5cb4980901cd809825
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EC 10664 bytes
font_02_sfnt_off00011112.bin
f7fc67c9d3715f6cfe304eeb9c87541ea4f66dc6251e42e254ffe783ed5388f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11112 17456 bytes