Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cebeea01c99d826…

MALICIOUS

PDF

86.9 KB Created: 2021-08-10 09:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 086d44c7fdeca1b2709f801815dd0342 SHA-1: f02822acb84aa65b84518f2cc0e1e680fac06e5c SHA-256: 1cebeea01c99d82649a5ad108dc3736a4b9b9b0db7acc75cc68e610a2f6240f1
176 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO manipulation or to distribute further malware. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da607b9735---1462098395.pdf In PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bc848fb0be9---648296084.pdfIn PDF document text
    • https://kede.org/userfiles/file/25657671140.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/882ebb52d4233616e98f013b42eb63e4/83246813718.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/jofagewe.pdfIn PDF document text
    • https://lapakunited.com/contents//files/76297957410.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/jaxaseniruliwasavovil.pdfIn PDF document text
    • https://adikkedua.com/contents//files/86901236181.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/sir4dqca4knkuo8g50poc9psm0/zasip.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/nudiw.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/8b6fc286015ca3302934aa18cc2c0889/43055021832.pdfIn PDF document text
    • http://zzquansu.cn/d/files/81291870404.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/giwejisidowagirukuba.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/39335807494.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/gelemabafabikolege.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/a64f0a0637adb0c5449c31d7df0c8989/28397177602.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/v622r5s8hca20h7d1eghfn9ce4/82514969684.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c17029448f---tiwep.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a642691d28e---bexukewasuzomimoli.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cde91894b40---filurenuxerurojamuru.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccee2bda47---39711311710.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/544d32cd6c3da1baac02a4c48bbd4637/3174291088.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/f1927a5deb4b1d488ea1ddd31f72efcb/25416404891.pdfIn PDF document text
    • https://sambelteri.com/contents//files/guxarolekujafe.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/82072904507.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=denton+tx+criminal+recordsPDF 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_off0000ef96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AD 10636 bytes
SHA-256: d18bc5055170e781de1a37062a994abe74bfe775a545c6b888692da0a53995a7
font_02_sfnt_off00012006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12006 17308 bytes
SHA-256: d21951eda4c0d4be668bb3aa1cce159c86f706433386606149e9f631fed2a170