Malicious PDF — malware analysis report

Static analysis result for SHA-256 f479a2906aef1d27…

MALICIOUS

PDF

115.3 KB Created: 2021-09-18 05:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 89fca7d4c2e6f1f1598d31f0eb9c88f6 SHA-1: 3cdce712f3a76a4a2f7016f314a4cdd9d8d58aaa SHA-256: f479a2906aef1d272093f45a59529031b4b4e9cce1ae72925f61563e8aa034ba
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. It also features a link farm pointing to numerous URLs, several of which are hosted on compromised CMS uploads or disposable domains. This suggests the PDF is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=hypoglycemia+versus+hyperglycemia PDF link annotation
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/93504634433.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/12707334123.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/nefavotutigejemuguxi.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/16238085024.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/64523992124.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-12/20210912060232805974.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/86064384770.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/nagisesopotolavexodixofuf.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139a259564b3---11234071328.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/12654624780.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161312d05c53d2---69775339592.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/koliz.pdfIn PDF document text
    • https://mauspro.net/upload/files/xudoruwijikoj.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/h2c7bgjk0nqsbfbe0va2l4f041/seduxiganos.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130e5284839e---19044097491.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/xuredibidisuwomanelazuran.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/718b078b2d276b89e92f4bd1c3eff702/9412455175.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/31066950375.pdfIn PDF document text
    • http://jobcred.com/rk/jobcred/uploads/image/file/tizatiwufit.pdfIn PDF document text
    • http://fajni3333.fun4two.pl/uploads/assets/file/91934663513.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/63021862969.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/96488787936.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/fusodukifag.pdfIn PDF document text
    • 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_off00015ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AD9 10892 bytes
SHA-256: fead6b717f11000312dd13162aad30313d8014ca7fc6f3a13c8f1f12ab68b1ed
font_01_sfnt_off00017408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17408 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C1A 19532 bytes
SHA-256: 82de9feb4d89e2a8a76f9fd5c08d0a4c786ea642feeed3166ef978ad6c787e8f

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