Malicious PDF — malware analysis report

Static analysis result for SHA-256 319e9b162f9475a6…

MALICIOUS

PDF

95.3 KB Created: 2021-08-23 19:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f2ea595be7e37743b9a8042edc058e02 SHA-1: 54d6e406a0e780ccbe94a8ffee89e850fe5fa580 SHA-256: 319e9b162f9475a62c4c2dc679fa8921135884f9084a83edb4119b09b7a2cf82
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous links, many pointing to compromised CMS upload storage, suggesting it functions as a link farm to distribute further malicious content. No scripts were extracted, but the presence of multiple external URIs and the ClamAV detection strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16089188d671bd---zuxar.pdf In PDF document text
    • http://mtsskzy.com/userfiles/file/35123008124.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612187ec9b9e3---nesarozijiwi.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e2dd026df---pudel.pdfIn PDF document text
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/4970543234.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/c51243593708d302d6a7cdfc9ee17a0d/28105558262.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/66835730641.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/89878686039.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/gomasepoxifumo.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cc72d97a3---19023738881.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/5b89470eb80e7ae631c7f6aff2ec7956/vibawinotafaro.pdfIn PDF document text
    • http://iworking.vn/uploads/files/kisatidoj.pdfIn PDF document text
    • http://candientuvibra.com/images/file/xebigelaki.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/vizebilebazewune.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/90245924781.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/6b55237d35048d043c994282deaf512c/zuxanagigaboxobavejomasa.pdfIn PDF document text
    • https://hirurgija.me//files/wefukamofezoxuj.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/20907845665.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b8816e61add---88347252567.pdfIn PDF document text
    • http://transsnabstroy.com/userfiles/file/joxuviba.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6dd691edf3---filigogid.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/50905818525.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a43c173995---dunatinesujevufonavojan.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608313441c691---nusemakujoku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=top+motivational+speakers+in+the+worldPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/98062311981.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_off00011022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11022 10864 bytes
SHA-256: b6bffbe5779263fea2d35c448f98db2fa428f1e1f659770d4b62350b952e8651
font_01_sfnt_off00012918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12918 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001412a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1412A 17568 bytes
SHA-256: 4a48a0118af16a8eb392cfd1b7800986f4ed4a6898ca5f4af1dc8a074b72cee8

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