Malicious PDF — malware analysis report

Static analysis result for SHA-256 9397262da5690c32…

MALICIOUS

PDF

71.4 KB Created: 2021-09-28 10:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f3b11e94f4c571b8c01c581a021294a4 SHA-1: 79668809815e7fa74b37d43079f3f680521c7962 SHA-256: 9397262da5690c32046d92e20cf5206ec6fbc7fd7a0e67e747750748895f5898
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature.

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 http://heimundsicherheit.de/userfiles/file/levifos.pdf In PDF document text
    • https://pielinks.com/UserFiles/file/47355257937.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/85593677001.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/15288562260.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/68671456250.pdfIn PDF document text
    • http://premiumdrinks.eu/userfiles/lufijarewixilejumati.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/jifudurewanux.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109110135016136.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/72042215423.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/sevulujorezugoruxogusure.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/15366761981.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/49095372208.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161408f4894ba0---14618100729.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/gafewuvas.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/kotekozuzevipusuvefipaka.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/31346762906.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/1704261748.pdfIn PDF document text
    • http://www.520amis.com/upload/files/63006098449.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/59834651628.pdfIn PDF document text
    • https://www.vconsole.com/ckfinder/files/lezifepezirumuburizup.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161511f9f3e582---53130023389.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/4gnl6f6gr0k12pjgjh7ur1pjc1/41262313983.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/98732890547.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/dipelilunolox.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/9ces8v7m12qcl5of1sootk4p95/41122515488.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=what+type+of+file+is+pdfPDF 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_off0000b4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BC 16928 bytes
SHA-256: b24289e65106d48bc509ab01c03c7d893875edafea7952859879fef3c6d55187
font_01_sfnt_off0000df9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9D 10496 bytes
SHA-256: 4ab2ad63113b06a7f2616210d3e7274cf36f77ec0d280435f6c67514dbe6d9ee
font_02_sfnt_off0000f7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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