Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a4d69190b2196da…

MALICIOUS

PDF

69.1 KB Created: 2021-09-16 06:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f99110d644799de5a720f362b252a3ae SHA-1: dcf96e7cb2bcdf9adbd0f3b691b8b5b8491a6daa SHA-256: 5a4d69190b2196da90f7cbfdacc6b727ee7d27a37f0b386eb023bc92586ee2d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a focus on directing users to external content. While no scripts were explicitly extracted, the nature of the URLs and the PDF format strongly suggest an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=numeric+letter+code PDF link annotation
    • http://avalon-essenzen.at/userfiles/file/rureralusur.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/purenemezikoladifo.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/31957842384.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/855997ca54214bffc94397d67b83d4a9/jofulu.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa1602d3a3---71511048057.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/63581165898.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/3f07618b43efd02e9b4463e23fd13972/vodekosadigebuxamixilusag.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/wisusalofe.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/bilatulimolaxemamerugiji.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/runeleg.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/49473963352.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/92455120711.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16139db2643eaf---koxejo.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/61758536040.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/51723757229.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/75255218541.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109131635504588.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/160756595502.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/15705528866.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/jenojadavapomavulusumitup.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137831f4acb3---31012762943.pdfIn PDF document text
    • http://iphysiology.ru/upload/76545064603.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85347160209.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/93500345075.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_off0000b368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB368 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7A 14580 bytes
SHA-256: 46f872c0b0dc9cd10790260a19cfa8424f303de887ffc4cbeb9bdd5089c0c4f4
font_02_sfnt_off0000efd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD2 10172 bytes
SHA-256: ce834f675fbec3c2498747f5130a1baed241c32042ca4ece073fe614389b1093

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