Malicious PDF — malware analysis report

Static analysis result for SHA-256 10173a1c91450303…

MALICIOUS

PDF

81.8 KB Created: 2021-06-13 15:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 452e2f33f6596520c34e0160a839f26a SHA-1: 741521b6860ab05c6bb58ce6a49a506409098fc8 SHA-256: 10173a1c91450303ca8cd782ddacf3336e7f906edace99b9758ca1bffc59d776
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains multiple links pointing to potentially compromised websites, suggesting a phishing or malware distribution attempt. The heuristic firings indicate a link farm on disposable hosting and compromised CMS uploads, further supporting malicious intent. Although no scripts were extracted, the presence of numerous external URLs and the ML classifier's high confidence score point towards a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crysiq.ru/uplcv?utm_term=geometric+probability+worksheet PDF link annotation
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/6c09b32ef7f9d106321f638307ed225d/23502999443.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/e855c7ec987ce00537a08d724794bada/12626408.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966fa4a7a04---12850155670.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/62p5ublorcisff4bv8hqp1vj3e/83932414091.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/56641775528.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/38255511576.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607b62f5be698---88633546109.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/ae279a3029532add7bf988f438d68ab9/37864084898.pdfIn PDF document text
    • http://altinay-law.com/images/file/91205232113.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210609_C93FE9D91FBF27DF.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/tolipuzuletebagokunog.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/11672575802.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0506cd76c2---27457277022.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/32749195523.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/b7ab8aaa8d7ca5ee754f61382deefdd1/napiradures.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://mediaget.com/userfiles/files/palowerakelojaletotiru.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://scripts.sil.org/OFLIn 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_off0000ebc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC4 5604 bytes
SHA-256: 22ff3db9eb395d54ce29f380e2e2d0ad285284c711212274269c3885f21aae0f
font_01_sfnt_off0000febc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBC 11220 bytes
SHA-256: 51166557865e18979d91da0fd77b2e318a67249c9eef3d7dca36aab77f8e07b4
font_02_sfnt_off0001253f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253F 16060 bytes
SHA-256: ae97ebdbf5cb6679ee3ae7f6f8963da9ec2437ada1f672a33085bc8cbe806833