Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebec2f0bb58e9503…

MALICIOUS

PDF

70.3 KB Created: 2021-10-04 03:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7ece61cba2da468582864e51c6dea15c SHA-1: 81597166fe6d7e169578a61e66bad2bd5a170868 SHA-256: ebec2f0bb58e95031104fe04a6121b10d6f8ef55fc6a13bfaa2a3fb76e59fca8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous embedded URLs and the 'link farm' heuristic strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://eapver.com/upload/ckimg/files/202109140509131114.pdf In PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1615a332951f11---gotoxemuberiguxe.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/nuxiniza.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/56672671779.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/61245663099.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161488a687c7d9---sojefarowesofamoragi.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/76869183868.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/nagijubiful.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140066821504---gemudo.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/budizaxajakurivokogovesap.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/27123926553.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/defosuratelusovosuji.pdfIn PDF document text
    • http://japhina.com/upload/file/diruletamesatogufon.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153bdc4a553d---32504510631.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/90235774131.pdfIn PDF document text
    • http://info56.ru/userfiles/file/5799886020.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/ropimolobujigigedigupo.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/30870963128.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/84121417370.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202110021221055410.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/24846684208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=austin+powers+full+movie+free+onlinePDF 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_off0000aed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED3 10588 bytes
SHA-256: 912b6e4e058a1964f50674a242e2920ae07f731b584691c80d30435b50e2ff9f
font_01_sfnt_off0000c713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC713 17012 bytes
SHA-256: 988ff8b6b3ac1243619554442999c1e201ba44486593ae5b54f72fe2bcf354ab
font_02_sfnt_off0000f217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF217 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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