Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b603ebae7854ff…

MALICIOUS

PDF

81.7 KB Created: 2021-09-21 04:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8cd8704325be0d63efd184347b0418f8 SHA-1: 7d80980dc06e1003674de946f9d4c65e32f9c5c5 SHA-256: 79b603ebae7854ff9d33522b768df5537d55c8d64c688e8abb501bbbd7799bc1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest the document's purpose is to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://homestationrealty.com/userfiles/files/55422924667.pdf In PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/35693253243.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132a1e4d862b---jelidi.pdfIn PDF document text
    • https://keongracun.org/contents/files/38912249222.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/09j87pk6gddkruo6il6cio3ca0/10097601274.pdfIn PDF document text
    • http://apcmagon.com/userfiles/2718944214.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///99420603888.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/90447427972.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/52352060560.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/vaxinubixawi.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/91092834243.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/buxujatidijowojutomuj.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/sejare.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/32730556189.pdfIn PDF document text
    • http://wamer.org/userfiles/file/5218408421.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/90402211221.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3100258c0cd9057fbfd675f1b122b803/zubos.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/xomavefovopiwafevuluxer.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/popuzine.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/bfee587e57849405b466b6b36d9d569e/zilop.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/51554967843.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/gizediziwefam.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/98923724230.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/79441818116.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=clumsy+ninja+download+for+androidPDF 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_off0000da1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1F 17728 bytes
SHA-256: f563dee0f58b1d135f642c21d94fb7461591fc17570a1e3e207c9cfeee5c96b6
font_01_sfnt_off00010893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10893 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AA 10744 bytes
SHA-256: 09ca26a5f6cfb8f07794467d5bb58c6e1cbc7ae133d821633822af6840e8d8e4