Malicious PDF — malware analysis report

Static analysis result for SHA-256 52c48a1f3ab9402c…

MALICIOUS

PDF

88.3 KB Created: 2021-07-07 09:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4f4e3a7532fb4c61abd3dc0309617dfa SHA-1: 8ef83db1548a26772fa804c56627da0cfa699994 SHA-256: 52c48a1f3ab9402c63372f9b202443561f4aa6add72ea7d347e88e735faa076d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users to potentially malicious content. ClamAV detection and ML classification confirm its malicious nature, likely serving as a phishing or malware distribution vector. No scripts were extracted, but the structure suggests exploitation of PDF vulnerabilities or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://coretry.ru/uplcv?utm_term=energy+band+gap+for+silicon PDF link annotation
    • https://ivanamihic.com//files/zuzevajoxozobe.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd4f32a4ff---mupuzonebifaxibifamilame.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a037ab0a0---vaxugolu.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210620145020.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/4th43okn45qnfbu9jgiffa9ong/binepisefezagob.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/bc3ce0d3dc8532e66f5029c926696c71/vofabokixifakoz.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/cb60f5556c408631e96f1e8b695a965d/fetitazu.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/pemujuk.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/51a06d87337fd089d1bdffede9bbafdf/80494551261.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924a59bae91---bowub.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/8r630lj0tfvv134695r16gpkph/dusimibumawugejon.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/439a140134e7677d863bbc2329d82686/doganelivowibenegexaf.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/252045285011.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/7f655b98242ee997556ca15bd4e755b9/ripaligewunotowulamepa.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/74426188508.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/80480716612.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073fe338b3fb---67617617686.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/5f989e665af989de990bb71f6416fb43/18031729090.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/312a5fc1666a8390531b1f02b2523032/46078560946.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/hkbdodr4qtq94nrjotmo9l59b0/17104027568.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/53407840611.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/93906925862.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/8l0v23hgqq0lh1et9pt0ooftrt/77657317055.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/5ht3djm7fhhtktk989p12d7cot/bigudejoxuzeponidapuka.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_off0000f115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF115 10936 bytes
SHA-256: dc8db44f419f534e096dca8389d125c1f2097d2ea49c6762f1ff71c78237e887
font_01_sfnt_off00010a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001222c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222C 18992 bytes
SHA-256: 272b033a77a6851e688f1da040691cc6802c2520282e10fb4721938eb34924f6

Open this report in the interactive analyzer, or submit your own file for analysis.