Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ccd52f9216764d1…

MALICIOUS

PDF

87.8 KB Created: 2021-09-05 23:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 05fd7fd2d08fdbaf7776cae521f3ab94 SHA-1: 907db9c977c4f798292a6dc2d960ccfa1caec562 SHA-256: 4ccd52f9216764d14540026124033a6f7285bd5c37da351492a8f711e3dbe8ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=gigabyte+z390+overclocking+guide+pdf PDF link annotation
    • http://pm-ural.com/uploads/files/58908915758.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4c1068e9c---digevefe.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210821035305.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613260cb83b9b---81838593507.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801c6a9010a---vaviwemedaxeselewidoku.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/46113735359.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/58909615587.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b213a2e0c---46563986305.pdfIn PDF document text
    • http://ridendo.cz/files/file/datimojik.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/b89ce20505d3ab3eb13863689eea9898/64379261486.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6529e57c77---36933024052.pdfIn PDF document text
    • https://dprkoreatour.com/uploads/files/pozorax.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c756741c850---89577642677.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb2d494d7f---37037194969.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c166069b871---33773184316.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/54361519280.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/3vjgmfd9a16npd37qsr3c1bgd5/80789351260.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/kerak.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/51372884140.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/99269341455.pdfIn PDF document text
    • http://alkanboya.com/files/file///62479827111.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/17610376856.pdfIn PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/ninimawiwivizizadebud.pdfIn PDF document text
    • https://wita.lt/images/files/jadagoxo.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_off0000ed93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AA 11700 bytes
SHA-256: ff99c1ec6cb8e70eebec2e14c63d37544ffd19d21aab6c1ed8f1c0c39ea1b9ac
font_02_sfnt_off00012157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12157 18752 bytes
SHA-256: f137a1b8ea5feb4615a1acd583c72acc308192e0059072e8be422b397f188998

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