Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c49dc374f3d15f…

MALICIOUS

PDF

81.3 KB Created: 2021-09-02 00:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f282e0b3090ce47dbb89db9602a6d1ae SHA-1: 3f60b5b562adf14d3ead54d460cbcd938f3f0e50 SHA-256: 11c49dc374f3d15f4f52941c5242e0a3f5cc24efba0775a75e1fe537c53b0266
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://plasy.com/uploads/file/78933347730.pdf In PDF document text
    • http://christopherdallo.com/file/xinafuvavinona.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/94688344229.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/zunibefaletepujox.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/pikutuzizaxiwesonot.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/gejefedikurosesor.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/20215328880.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/wekuxenaluzutimekupo.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/8b50h416okdurh2ebv927t0998/94765089708.pdfIn PDF document text
    • http://1careglobal.com/upload/files/17164422630.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/86027530280.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3dcfe92a8---62976553720.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/larumas.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/lasijeku.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/74c0b6c4a49570691e3c5a60dec12708/lagunejovogosi.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/358603db1702a700fb532c119f85ac79/dopubakedar.pdfIn PDF document text
    • http://clingac.com/d/files/gatasitagawoturatupe.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/f1de6e9de67113a88aafcb4259eccb6c/pamibelodabifapud.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161293e551fb7e---deraw.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/50623378808.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/91903732247.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/rozufiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=polygon+with+5+verticesPDF 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_off0000d6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E1 18264 bytes
SHA-256: 7c29581d80646b07b05d2935d49edf3f73c5c1f141e0ed9c4e101fc544f3162f
font_01_sfnt_off0001066d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066D 10748 bytes
SHA-256: 28416b461397899726e61768b87ba54f7bb26f81a85535bfb39efcefd3ea233c
font_02_sfnt_off00011f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1