Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce009442dfcb3b64…

MALICIOUS

PDF

95.4 KB Created: 2021-07-08 01:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4059e81793245dd873e858abeba2837c SHA-1: 1bccc0eeab4babb6279b2febce8f086db42232d0 SHA-256: ce009442dfcb3b641d93c528e2426a5d3596cbf64cafbc4e093e418942f44b00
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute further malicious content or phishing lures. The presence of external URIs and a link farm structure indicates a likely initial access vector via spearphishing, leading to exploitation on the victim's machine.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://yjsyrj.com/userfiles/file/dopelelaz.pdf In PDF document text
    • https://inncredel.com/uploads/jejelunezorelopaxopalad.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/selabuxetokosatefinefe.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ecef241b60f33fdcf7cf9a791f0cfc3b/vetijijipuwoxefokafixonop.pdfIn PDF document text
    • http://prospr.fr/ckfinder/userfiles/files/9010730557.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/vetosifetupewexinefuwebal.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/39496034927.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e78463a584---86860537506.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/dexave.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/mogobemobepet.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/f6ec5fb24589b703575bca51983711c6/40605592259.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/gm544m7t0s81alo69cms9idp9g/fimesamux.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/e02fd5af1096dfe92cdce266d7f92129/guxoresizeloxazal.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0990b20c2---95200982321.pdfIn PDF document text
    • http://passionsavannah.com/clients/0/0a/0a61c075fa1d7d91f8ce2ef588f7e9ce/File/89270555082.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/d52aa7843c71e60ec64261d046190278/kusiwi.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/69360269372.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5b1b4995a---34495103578.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/kisodaxe.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/60553757677.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/1tkqmgmm7sa6bldkhse1ib6661/24732652737.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/wonokokuz.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f412b40497---fumarivaziwafonikawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=foul+smelling+bloody+stoolPDF 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_off0001143c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143C 16904 bytes
SHA-256: 0690ba23246a3f72c2fbc54c56428d448434766af3bf8a2685242cda1bfad0a0
font_01_sfnt_off00014078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14078 10660 bytes
SHA-256: 0ed6c32b4012873351134aa07b8e3e45928c0651e73a1fe249227c1f4e4df321
font_02_sfnt_off000158b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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