Malicious PDF — malware analysis report

Static analysis result for SHA-256 c40536fce386ca05…

MALICIOUS

PDF

81.5 KB Created: 2021-10-18 09:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bf725c781740f186e24429670dbb8ae0 SHA-1: 0184e80c37961f4ac43d377a6194f7bed9f7c2d1 SHA-256: c40536fce386ca05e4e002441b444dac591670b03f9fb0d298182c119364018c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and presents a link farm pointing to various external URLs, some hosted on compromised CMS uploads. The primary function appears to be redirecting users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://domki-kopalino.pl/pliki/puvatadarebit.pdf In PDF document text
    • http://aloisiquadri.it/userfiles/files/junofiligorila.pdfIn PDF document text
    • https://stvorki.ru/files/file/55079220669.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/59118879993.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/getot.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/nuvonakobeka.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/wopuwezavililafinujafalux.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/wisagurelebepixesese.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/57390345316.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/202110111059343833.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/puzodusetukopavujodi.pdfIn PDF document text
    • http://jcsh.bluezp.com/ckfinder/userfiles/files/49270452590.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/sifalatetidawerorufapitud.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/futotupolane.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/11104669254.pdfIn PDF document text
    • http://nature-revive.org/files/file/63044713036.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/dogepuwozobupoxefamin.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/b55449162260aecb8ba30b4c5e18e180/zaxadudevuma.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/81917276353.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/60063d9989bded819a27f75bc4451448/18360298340.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409ad0a446c---golujukupore.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/58754048198.pdfIn PDF document text
    • http://iphysiology.ru/upload/zenaxatinavosujavajikopig.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/jetaferimikofaloze.pdfIn PDF document text
    • http://brain-sh.tw/upload/file/zelukevusafotobefopupobi.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/tisifumiwuken.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/HKUGBsJGI0E/uplcv?utm_term=all+tongue+piercingsPDF 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_off0000da89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29B 17544 bytes
SHA-256: 7920b079764130e69998215b74becc58c00e2dccc157463357ba7d27d4266d86
font_02_sfnt_off00012071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12071 10468 bytes
SHA-256: de45a5f2afb403166e6b792f64c459ee658a2edbacecbce7899e1f529ef78f27

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