Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8359ea165aacbc…

MALICIOUS

PDF

83.6 KB Created: 2021-09-06 22:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d633d3d0f9b79737ec4a211a186c4752 SHA-1: b73e584284b486f10d3800817361e87d7b700255 SHA-256: 4f8359ea165aacbc2ed7e5f0585d270dcb5b181ebcf2fb19bd82e1e02a9214d6
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of exploitation techniques to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://inwebjor.ru/uplcv?utm_term=teaching+english+grammar+through+songs+pdf PDF link annotation
    • http://x04ydivan.ru/userfiles/file/futuxavezividorasux.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/2b8e2a0f1fb5a1ceda6bd77dd291ea62/bijidawisikavopowivu.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/k6qufj1tt8lqt92mq8hlmlh7bs/84473228844.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/37684813816.pdfIn PDF document text
    • http://dnepropress.net/files/file/pezupilivaluwerorog.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/17cd41de972ba89823c092ffd85b8142/xufibagej.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/81919604214.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/237d4a13d5a8709880a8d21844f655a0/64733594938.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/53737181594.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b18d1d960d---36677068840.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/kibimefevofulubalefe.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c562580f95---58212495854.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611f4c5240c37---3850978630.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/62139924256.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/2df26ceec5dc05820c8cae3edaf014cd/nobimurubelitijarokam.pdfIn PDF document text
    • http://ggled-smot.com/ckupload/files/tidig.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/sekawonanada.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/cf6260980cc3a7cc2afe305c3ad6525d/rezexigopesilodifitizaba.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612d3a946073f---nadexedanomobebalijosi.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc2e446eefb---moxarerinelekarupulir.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/8d84083f3893e28f2549425caac97f33/fujifiwubekaxewonusod.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/07/files/210728041903.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160f3c11d257f8---25995025663.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/26728141060.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/gexagesoxokarivezilifu.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/64672667955.pdfIn 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://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_off0000e056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE056 17944 bytes
SHA-256: 231281b2118c17c4d3f0951548447a3e76fed319913e066bdfb2faa52b09bad8
font_01_sfnt_off00010ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC4 11132 bytes
SHA-256: 0220cf75c974ffefb44b9f68f0175b2dd7ac98c6036627f54804a9fb0d609be5
font_02_sfnt_off0001285d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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