Malicious PDF — malware analysis report

Static analysis result for SHA-256 c01d04a2be244961…

MALICIOUS

PDF

68.2 KB Created: 2021-09-26 21:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8afaeea146e17634567eb5bb44ccca0f SHA-1: fd793c640395f6e304dfb23e05186086bb369ee9 SHA-256: c01d04a2be244961d04b9744635fee6fe55d440d96131f00aadb5353b827fa99
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The document also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, indicating a likely phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 https://biogenetixpharma.com/ci/userfiles/files/duseromozusugipi.pdf In PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161494f4848cb8---moditiz.pdfIn PDF document text
    • https://www.algeos.com/js/ckfinder/userfiles/files/terujiwezuranusuduxev.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/34123287796.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/favajufikixasesejun.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/16491082921.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/88426334705.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/27920015334.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/xebetifolo.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/fotepuwu.pdfIn PDF document text
    • http://chapelguild.com/images/usr/45664383775.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f46755a641---vavur.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b66b89fe62---jilavavu.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/21217615006.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/zaxojulinoz.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/da2e233aa4cab40b9fd481f7e80defec/fodep.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/57867310309.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/55315940920.pdfIn PDF document text
    • https://phuquiland.com/upload/files/41619956670.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ml24js7rmjm259srkuop8gf9b3/fokorilikopikojinowu.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/mibatapovuzoxitikerife.pdfIn PDF document text
    • http://gardatrans.com/content/Files/koxogawabuka.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/lutojonuveluwinivagurexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=hiper+scientific+calculatorPDF 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_off0000adc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADC2 14788 bytes
SHA-256: 3b5e0680c8834578fc91e13904a8d690391eda8d50967f82b6209adcc895d897
font_01_sfnt_off0000d32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32F 10564 bytes
SHA-256: 74d675bcf6be5a55f7bd18918f60701be150d03403b6cba5e7135d057454c476
font_02_sfnt_off0000eb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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