Malicious PDF — malware analysis report

Static analysis result for SHA-256 336cbae68525dfb2…

MALICIOUS

PDF

84.1 KB Created: 2021-09-14 09:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8883bd9c814eb37b3bfebc0cd6677741 SHA-1: 06fb596550d5b19053826cd56b0c3af4ea8ee1c6 SHA-256: 336cbae68525dfb22516484e6576aa0449a5598e275030db742588f9a1d0dc88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised CMS uploads and disposable hosting sites. The embedded URLs suggest the primary goal is to redirect users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://cructi.ru/uplcv?utm_term=instagram+symbol+in+text PDF link annotation
    • http://www.radio-kum.si/data/files/gufujefugukawokiziver.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/726027544.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327857be84d---93358916493.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109082128543425.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/29898923515.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/sawid.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/xofupokipagedizinofe.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/vumawezaja.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/libejipuv.pdfIn PDF document text
    • http://i-tos.com/userData/board/file/voxiki.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138d0b71c842---sipavax.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/24613036325.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/lateforutuvetulufowuxezig.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/vgc1rhe7k05j3hgt7va1l3r543/67907954608.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/44878115546.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/sesuluwuroboxobarikode.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/fewovewebususadobiluwi.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/e365eb9c6524c2f5e56e82500aff02ad/rumowaz.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/jaxanejimapeso.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/51767489476.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/4522290175.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/kusovifu.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/79755395456.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/wozobotitirapuxazemisef.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f49e129de8---letebiliba.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/zexatuteteliruve.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_off0000d4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D9 23456 bytes
SHA-256: be0a30d11608847e4ecff0fc4bbaad182c5f63c2ad0d8fcf183c73287042dd62
font_01_sfnt_off000111a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A3 10756 bytes
SHA-256: 7cc63c7e5d41159d877627dced1df01c041e2118ec5f4424ffa9dcf07b5fe07d
font_02_sfnt_off00012a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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