Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd026ca6fb308cb…

MALICIOUS

PDF

77.0 KB Created: 2021-08-20 00:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ccd49ee130580548e5447994070f3e70 SHA-1: a0ccf80fc47c42e69fdb4271240ee8eb6152a368 SHA-256: cdd026ca6fb308cb0bfb8d4535cd54b8008f81c930be090471da76ebf41ae58b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS upload directories, suggesting a phishing or redirection scheme. The embedded URLs point to various domains, many of which are associated with compromised WordPress sites, likely serving as a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d566726d820a53f9aaba67e1a0a72939/50128205344.pdf In PDF document text
    • http://hanleyresources.com/images/3003428917.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083db2955fe9---vuziwizamomarolave.pdfIn PDF document text
    • https://wangwangcamp.com/uploads//files/202108090451419883.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbcd0f1cc2a---xawabituxal.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ulaph3sp1l2h5v0r7ih809icm3/netigefajejupurupafira.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/72094686182.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/86914284416.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/9efcf29d3kfjdq0sdkfh1ls4u6/80702135069.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/19bc4ba606d3fb1c966da033ef6f327b/18794063456.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b6455773e3d---sipiti.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/97a882282be1331915877d92a33851fa/dazukifa.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adabe07505c---35363516757.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/50027280892.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/dapuzeravesixerozanuwif.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/lovudajomuv.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfb1ab58f5---4463433746.pdfIn PDF document text
    • http://rentaruedas.com/files/others/tesoliseluxarexomukikilom.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/vudowozivabudodowomaxiv.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/31a167f542e4a230b3596e0bd29865b2/80604994800.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/10245848120.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160833a7f0613b---tutig.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-7-7/20210707140944726663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=ah+kalbim+hint+dizisi+%C5%9Fark%C4%B1lar%C4%B1+mp3+indirPDF 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_off0000bee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE7 20672 bytes
SHA-256: 51e0a00bdc9620a832831c02f94cb051e3a3e21e9f204d4f830a452a84c83704
font_01_sfnt_off0000f105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF105 11140 bytes
SHA-256: 938ae0daa3353bee29f4cd7f1d7a1712db0efee12e0a868162a90b2f9384a0e5
font_02_sfnt_off00010a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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