Malicious PDF — malware analysis report

Static analysis result for SHA-256 3318d4e0b7ea8075…

MALICIOUS

PDF

110.2 KB Created: 2021-08-01 16:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4d2ece6f987af5df9287dc1f71e22f33 SHA-1: c4b75be9b21afd69e0d281139a65e3ff21976885 SHA-256: 3318d4e0b7ea8075f39d135cd9d2cae283eed00f28b284c7b71aa77d2f708caf
176 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://coretry.ru/uplcv?utm_term=expert+grill+digital+thermometer+instructions PDF link annotation
    • http://uralinteh.com/uploads/files/kapobesolalenapimuf.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/wenasivarisadetunomagizu.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/kaziworalosilajisoju.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/e98f0c3fa315998584c126a854b6d07e/82564093517.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3f79142d8---65130375834.pdfIn PDF document text
    • http://suachuathietbi.com/upload/files/44943233764.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/56761109520.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/20625477091.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/ab50bbb4f18ff3d7a4aceaba9c73912c/zoloxekosobikej.pdfIn PDF document text
    • https://ever-progress.com/upload/files/pasatosukafugojutevap.pdfIn PDF document text
    • http://jump360.co/upload/files/20210716215016.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d90441b2ef---77092292673.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc849bb751---makobevibijanad.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757c5c9b499---40112802223.pdfIn PDF document text
    • http://anjilh.com/uploadfile/file///2021043008461184.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/73581346992.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee9e1270ad---rudakozudasam.pdfPDF link annotation
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16098b17d77fc3---lixujorufisowupililazowim.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210616233112783.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/xejemuvojizorezijeruxi.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/batipifutefasoloxiludenew.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/2b06fadcb39eff8b47eb0c7641c567dd/59995823950.pdfIn PDF document text
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/wepuzoxazunanido.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_off00014a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A8D 11148 bytes
SHA-256: 8a33ca64d7980d74b15707e828d4703561be263e812f0f728ce4caa20a3efe79
font_01_sfnt_off00016431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16431 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C43 16964 bytes
SHA-256: 67421ed6daf2f4f121e42256c60b7fd7a6129242f00b760da4dcf7143e773c06

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