Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a15fde71b63ae4d…

MALICIOUS

PDF

73.4 KB Created: 2021-09-15 11:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4c7c7178b1b5d68ae74e3438ad0ddb02 SHA-1: 565868b642a8238762d1a8d04ee8d56b7b25e5ae SHA-256: 4a15fde71b63ae4d5aed17612e3da06e64aa93054a82d118c26d6d59022c3e15
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The heuristic firings indicate the document is structured as a link farm, likely intended to redirect users to malicious sites for phishing or malware delivery. The embedded JavaScript, though not fully analyzed due to obfuscation, is a common vector for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://oniceh.ru/uplcv?utm_term=bf+aur+gf+ki+shayari PDF link annotation
    • http://0851gay.org/userfiles/202109file/2021091104485070554.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/46232595392.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/vedagedalisagerezokori.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/nuxalariteveperug.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/32d1bb9fb81541c9777aeb7d7347e998/62344225322.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137efed5c7e3---36590308168.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140083a7210b---sibeku.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161350de41d822---gedudalapufipase.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/20654944729.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109081802564485.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/5255310851.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/30612419856.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/36313564205.pdfIn PDF document text
    • http://ciskmv.com/css/file/37004570999.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/96100532361.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/datuvidekupofivi.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/soxiro.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/tojidetazixazufalop.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/99343458138.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/66678669325.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/13437994306.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/lerejoxuteniwitopurisoset.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA4 10352 bytes
SHA-256: 4002c3ba281098a2664482c81771aeb8293709f159098d8cb1ba527b35db89f7
font_01_sfnt_off0000d423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD423 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC35 16984 bytes
SHA-256: 3c903d7d3a53a84fb90f265fc305e379ecaa69994b4e42bbe88bdd034ef0866b

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