Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f1c254dfdff6cbe…

MALICIOUS

PDF

76.7 KB Created: 2021-09-05 01:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c897f8c19ed32a9d6c591940d1822ba9 SHA-1: b6ae9a1eff6269566420809d8fda64ee60e44aa5 SHA-256: 7f1c254dfdff6cbe3176a5bb20387c5ef4d3bfd1fe6333b483650a85f1fc936c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised websites and disposable hosting, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://flardochform.se/userfiles/file/bigivolijolokotovodulafo.pdf In PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/62882cbf2c20d1cfe360b74eb2158f3c/kilexevokapezexaga.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/12226515440.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/c8gkgqeqh5bv2onb78skuu18c0/buzedulu.pdfIn PDF document text
    • http://gz-gm.com/uploadfile/files/20210817_175551.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/11062603442.pdfIn PDF document text
    • https://festacontinua.it/public/file/46258388967.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100680d4b314---16976965266.pdfIn PDF document text
    • http://rld-carbon.ru/file/nagilalegivuwonemaz.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/78910504972.pdfIn PDF document text
    • http://wirheiraten.de/images/file/jujesuga.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801f5a9653c---38515078670.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5557d875e9---87961181089.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/mibejagoso.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/uo78t653g6359h37ga4itfvv7b/34485649277.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/17988651188.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/ftdl8e8brj5epas349f5e0pvi1/58710952936.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610a2acd0f9d0---2689018293.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/refetogib.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/rozekabawefiwulad.pdfIn PDF document text
    • http://sigep60s-ncbeta.com/clients/44785/File/sakidanezisavevidonu.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/dizajasisomelid.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/guxivox.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/nubogipi.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cbfabe0fab---kumoberigarurumo.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad04b8d8a8c---gipiwutapogepowigata.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=the+masque+of+the+red+death+pdfPDF link annotation
    • 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_off0000c9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D3 10732 bytes
SHA-256: ca026ef61f0f5656bba2b65b1491f92c939e70fa2e2f912c532e71308219739d
font_01_sfnt_off0000e24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5E 16428 bytes
SHA-256: 60e14696292335d6c817cf2157c55410392f0d4c70bbb3239e82e5c8cf551415