Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cad9e1694105a81…

MALICIOUS

PDF

85.6 KB Created: 2021-07-07 21:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a255b8e248fe01b8bd1cd1ab2555f6b3 SHA-1: 52573d78a3a49a6b147732005c64cecbfbb800bc SHA-256: 1cad9e1694105a81d51595c6d9383e0bce643a2f40e51f5d0db63653e2ed4cb5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of links, many pointing to compromised WordPress sites. This suggests the document is designed to exploit vulnerabilities or trick users into visiting malicious sites, likely for credential harvesting or further malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=low+blood+pressure+numbness PDF link annotation
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093f85f6a249---4233968566.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d706696231---44173910238.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///51406943414.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608168b6ebd26---99960673269.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/3u2tr9junlqf8ms5apepdgtott/xiworafugigonevosoxajelu.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/xesanadurafuw.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160abda29e248b---pexasokovimodemevijotide.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/10247176962.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea6fcedb51---vapofebanofif.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/dovobibiwavepa.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828001c181e---parokuvugew.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/84683805758.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16077ac935da5e---jivusopukolixiwej.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983808ee21a---bomuxugobos.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/042adeb39c59c4bbd0d97ab84f88cc1a/baxififorujaveli.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5a5050fda---fifadibonuxa.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeb642c5c5---rezawinojox.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077e991604b8---41103382947.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/4628795962.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/e8940278252425cf512f12a7162312d0/69456170345.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45907f189f---33474645161.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c6b62a8ad---vipumanateberewafeve.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210706211519978.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/apdvnhjgi6l4suonh857tth7u9/mofijazagiwovinije.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099da20d07a2---21419265412.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED01 10484 bytes
SHA-256: aec8edc26c935aefbb8142e76ea4ebdaa911d1f07d6fc0798721c74a40e98e32
font_01_sfnt_off00010495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10495 17172 bytes
SHA-256: 796d30611c99c158de65ea64035c379bb6dedcd2f17e929658b44fc9ed52e94f
font_02_sfnt_off00013134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13134 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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