Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c3a5f8c67a2538…

MALICIOUS

PDF

81.8 KB Created: 2021-09-10 05:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0a528ecbb70f0bcb06909edb40dc009e SHA-1: 475677db06b9cfbcbe511e66d4cc9df3f0dabb28 SHA-256: e7c3a5f8c67a2538ac4725c6cf9f0097fdb1f0ac607d58982ae669f304cc764f
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various external PDF files hosted on potentially compromised or disposable domains. The presence of a 'download button' lure further supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zgic.ru/!upload/files/kalumik.pdf In PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/gipufikax.pdfIn PDF document text
    • http://elma1.ru/!upload/files/futozefovejukowosel.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/76242840611.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/joxoxipotiwo.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/24280814235.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/86421686175.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/35309100487.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/28465464386.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/49830336686.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/vegorevirez.pdfIn PDF document text
    • https://digireg.sk/upload/66199235822.pdfIn PDF document text
    • http://bndweb.nl/upload/files/wudatabesimabub.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ca3a557bb---34256867819.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/20693579039.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161323e6c44e95---mosefapimujijutuvo.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/10665246831.pdfIn PDF document text
    • https://alev.az/userfiles/file/16021837831.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/33230558476.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gunabo.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/fureluzonanakovojubi.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/10349f18bea5b310a247d377b51f0d50/puguxiduponobonepalaminep.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/jirosudezud.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/b70ff1efca114aae9d81d85f504b8d13/davavezevewezuwar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=application+layer+transport+layer+network+layerPDF 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_off0000d9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DE 10640 bytes
SHA-256: 0caf658672dff3c68495109dba715f572d4e197997492cbdc31727a7919cbce2
font_02_sfnt_off00010a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A84 18232 bytes
SHA-256: e7390093b74e91907ee0b6ea46fb792d861791d930e6572b3e82568bf6ed9e72

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