Malicious PDF — malware analysis report

Static analysis result for SHA-256 369de12fbf9d0825…

MALICIOUS

PDF

78.6 KB Created: 2021-09-10 15:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c1aa2b6810dd8e0523e20f97945bfd37 SHA-1: 7d0a997cebcc27009c4fe2f6b6b9b50cc6a1ba15 SHA-256: 369de12fbf9d082570a0875c78678519d0015ec28ffd51c1f1d81790ffcc2085
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing or trojan variant. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to facilitate redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://smidgel.ru/uplcv?utm_term=elementary+statistics+using+excel+6th+edition+pdf PDF link annotation
    • http://studio-castiglioni.com/userfiles/files/zebapalebisoralamo.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/27b591e38736fe9567f690ccc26ebf4c/41931074739.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/senupajidagituju.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/95950556561.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/tafabipubudekulap.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/4b3d72c4032a3571d6f589b9c73aa0d4/61616763276.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/98808251905.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/33358462340.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/66405874489.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/gememojegidigowa.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/35691253850.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/30001539553.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/83040933281.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/lisadowasumiropitole.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/riginobavuwozevoxed.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/sedebalivoruwisevikezevoz.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/64041081084.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/83782053585.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/jiwexikulozi.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/30147320173.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/85155851808.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/161326550e5f02---89686922476.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/fofuwapuzusazoretegu.pdfIn PDF document text
    • http://feg.vn/uploads/files/62691665430.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/zowidunazupowatabekuviwob.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613641b514400---tibuwopabexotir.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/sejoxafifiv.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_off0000cc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE427 11532 bytes
SHA-256: 4f7e33bf8e7ddf4a03aa6fdaf7f1f6197c4a87babb0588aabfb6ca1f9d92b591
font_02_sfnt_off0000ff20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF20 17736 bytes
SHA-256: f46455f6cfbf033c6021a9f72a48815f2cea468d62488faafe9ef206fe1a5aca

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