Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5cc2f0bd545dc8…

MALICIOUS

PDF

87.8 KB Created: 2021-06-30 08:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9e0dd559bb1c7d9c8296bbfa457d83a5 SHA-1: 79d6e347f3c86531df98fe33dedeb38a3d288f03 SHA-256: 7b5cc2f0bd545dc848dfd06cf7d1cf66c14a7d30642fb286a36e8c399f47826f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://inwebjor.ru/uplcv?utm_term=leo+carrillo+beach+reservations PDF link annotation
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a7609ef2873---gugakilubudajalesi.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/suremusax.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/32347466673.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/47447184385.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd54f9fe74---zonajew.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/028352ebc8f2355c1b0ae27d0b8763b9/13809522540.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/72943375247.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/vaworiz.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/vedipo.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/26183314676.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/bozewujolumakoxagizulu.pdfIn PDF document text
    • https://susta.vn/userfiles/file/5187326572.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900c940ff41---muxowaposuwopomepani.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/a592f085ef01172a16d034f1c8ad8dec/37820854677.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/013848758ab93a372084dc81ba2ff001/letajugegefavusanonaga.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/9c76c3110daa358bbc601d041e582440/29967224208.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c105024df---41091067753.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/20989721882.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/tenevifupif.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/f72a66a2ecc481ac4adee682f670a98c/voliruk.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/41085924886.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/dokozijumitelurabap.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/vaxurilazarajarosisazul.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16088861b9d121---woditoj.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_off0000f411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF411 17560 bytes
SHA-256: 0108a4f7048fd05a2d6dbcee4c7be23045fea49bd33a5a16feaf9855e6d35472
font_01_sfnt_off00012275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A8C 10492 bytes
SHA-256: 4c59c117cd16a997a50fcff832cf31bf015819e762a09a1605f3d17c96c714ab

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