Malicious PDF — malware analysis report

Static analysis result for SHA-256 c96971432b696cc0…

MALICIOUS

PDF

76.2 KB Created: 2021-09-05 17:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ddda087c08be6a1b48e9b481a36956c1 SHA-1: ec4e28d456f6e38ca589c14dfbc108c14b9921de SHA-256: c96971432b696cc06de5db7ed7fa3a3dc21a398b5f68e57d065d873981603aa7
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a link farm. It contains numerous external URIs, many pointing to compromised CMS uploads or disposable hosting domains. The primary purpose appears to be directing users to potentially malicious external content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://cualuoihoanmy.com/uploads/userfiles/file/lovokemora.pdf In PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b218276a609---kagimuxiborowojeleta.pdfIn PDF document text
    • http://eventechsite.com/files/files/53659606176.pdfIn PDF document text
    • https://newoptic.mn/uploads/files/fevutawimu.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021080205423273499.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/bowusedud.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/19787386640.pdfIn PDF document text
    • https://coevent.ru/upload/files/jekiwoxebubadal.pdfIn PDF document text
    • http://strandedtattoo.net/file/12326434163.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021071616300846.pdfIn PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/saboke.pdfIn PDF document text
    • http://zeci.nl/im/image/rezaxojemobuwagajewifowa.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/efec6aaf294c7ce595c0c9c2a80f8f5c/37992649155.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081fc1d0a776---vidoxew.pdfIn PDF document text
    • https://fond.ru/userfiles/file/45406096736.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/tcf2vlkdilln1t2m9ie3sjfo00/bugegodalasokogujap.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/madoluvagaju.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cbcfff16f6---31009662367.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c5ac3457b---divadirixodaduxojapipi.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/37597238901.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/11165808192.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/81aa7e794708ba970dca48b4994f33f3/55870071827.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/lalepafotimopumaworagig.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210515181250.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=querido+diario+otario+pdf+minhatecaPDF 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_off0000c15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC15B 18540 bytes
SHA-256: cf5d0286c45802523b88319699c5837898711f82a9c6e7882e6657c4bc921b10
font_01_sfnt_off0000f0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CA 10828 bytes
SHA-256: 8c6426cd38cc440b80e220f6b74ab180dec8c8f9e85bdb7bfcea5015ac7943e9
font_02_sfnt_off0001099e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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