Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c699a7677329ec…

MALICIOUS

PDF

72.3 KB Created: 2021-06-26 18:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ea759d888242915f19b51689988bc496 SHA-1: 0fe52770ec4ed3f09f39dc13b75c0534c518336e SHA-256: 90c699a7677329ecc35125a015ca23dc5100cf046a964e06a8b6d518fadbec34
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links indicates an attempt to distribute or host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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=james+and+the+giant+peach+online PDF link annotation
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/t2t5ltee3mshi1p5fqklb59brb/65962533549.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b6c3de7dc---ruvomizujesodo.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/bpcv5g6v721ief2k7e0qa8n86q/wobujogizowejinaza.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/vomabivubajorarelo.pdfIn PDF document text
    • http://markone-tools.com/upload/files/wulitidit.pdfIn PDF document text
    • https://stvorki.ru/files/file/41501300718.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cde37b4f34---30244942298.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/61833813015.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/83875048274.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/netunebufivixiwi.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160aefa0651419---39946982081.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/3147153350.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/dofuvudakinirafi.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/uegijcm3offh1j79v6qau8qvet/kosemerulu.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/4oi3icsqo2p2ans5riu9362ckk/70689878219.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/26sdpk93fh4bc3usge0dfmgr4e/famor.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/valofonukom.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913579548e8---41924341012.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/vosowuzi.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/81c255eb1f95b00a9d483069c7865298/mefujerozebiguv.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/17b2c016b2ec6979d96c49bf6e4da461/senupazokadugoxixujunud.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077693a76ff2---56860876427.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_off0000b7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC0 16296 bytes
SHA-256: 21c362002b41a25f7d34694b173acfbaefb9d7b8f3e819b35cec5d79b4be0b12
font_02_sfnt_off0000f9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C2 10852 bytes
SHA-256: 9c0d4b1fc176d73e46f1b8f9858a0a8add921487ccb5da1c26029fbca7538819

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