Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c89d29dbacc173a…

MALICIOUS

PDF

90.4 KB Created: 2021-05-30 02:41:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 50fa6246ff90a4d87434479f4ddf4200 SHA-1: c9249f0ecef5c9c3bd950f702427d746d97a4dd8 SHA-256: 2c89d29dbacc173af4c9bdb0aafcd19daaaef3aad8fa11e8de9774aba516687c
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document employs a social engineering lure, instructing the user to install a browser extension or update to view content, which is a common tactic for malware installation. The document also contains numerous links to external sites, many hosted on compromised CMS platforms, suggesting it acts as a dropper or phishing lure. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://synerhu.ru/uplcv?utm_term=how+to+disable+gaming+mode+oneplus+nord PDF link annotation
    • http://homenet-spb.ru/userfiles/file/80166081853.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/822278768609bb5a2968ac.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609df6007b751---rewafupowinomawilela.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/judututow.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/41d4d751974bae8f2998e5a5fa7dbf7f/71185616258.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/53165753746.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16087435a99092---kazozetiweredatozoxen.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160720d772c9d8---95379783809.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/kiburewoferixudubo.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b4f379f02---74816981181.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/97543546152.pdfIn PDF document text
    • http://gyobel.itpublic/file/82349180855.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/76875720161.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/25596590917.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aa88583f5d3c1e665ac33416a1b04843/56600299125.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001208b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208B 5472 bytes
SHA-256: b0129e99684f6d6164bc336bc8b18e8e9c526c21838998dca009ffa831cee0d7
font_01_sfnt_off0001331c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331C 11504 bytes
SHA-256: 3fc5faa3cb278cd1d4adc06099b44e54b63da6e5470849672113a3a230208aa7

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