Malicious PDF — malware analysis report

Static analysis result for SHA-256 e85a817abc81d311…

MALICIOUS

PDF

89.7 KB Created: 2021-09-02 12:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a69953ac65b2fc1c30e9665999b8b128 SHA-1: 55fa4d4cc37638aa0ee6699696204d9d5c3346b1 SHA-256: e85a817abc81d311bd2038120ed79305615a2e4114d2592497ad2b9f81979647
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload directories and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and a link farm indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://fred-robin.com/ckfinder/userfiles/files/35373553499.pdf In PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/ce99b439b56df955b93c0d0564e26a61/80631511805.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/dotugof.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/runibogepezoterum.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/jiviso.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/risezuzirakirul.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/6501964967.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071162b80f95---noguvudoxusupumeveximoli.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/75838068796.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/0709e913f74d8858124f89472ec62036/65210983496.pdfIn PDF document text
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/sijugadefawimuvegelil.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6591c912f7---99042325686.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076e9f071a1d---sopivudamonerogovab.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/12575305401.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/37879225951.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/89583581902.pdfIn PDF document text
    • http://rld-carbon.ru/file/75028389030.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/195qtitfg4462esltmk8hk9jks/33639293255.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610baad80015e---19312276688.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/fofikalixi.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/zovinada.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f071192fe0---71854108496.pdfIn PDF document text
    • http://beiks.info/public/file/merokelipejiwin.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/1bf6b3d1d1363f40996e9349d987ffee/verat.pdfIn PDF document text
    • https://tadimtursu.com/image/files/jijaretejubedeweditopop.pdfIn PDF document text
    • http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/7823312089.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=apostila+atomistica+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

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_off0000f46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C85 10428 bytes
SHA-256: 5397d1feb7f3ed19a90c9a3356879c0926bcc985f8712d9184cf146d70d02e7d
font_02_sfnt_off0001242e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242E 20492 bytes
SHA-256: 90cdb850d129bdac91cdce080060c00c09aa814241c60b9622371c85b1581bc1

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