Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b84709e4d8b4f62…

MALICIOUS

PDF

82.4 KB Created: 2021-09-13 23:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f2248f1be39340c557590517b5397bd9 SHA-1: b9029a6a50c67a095bd14cc631cd33b5d26d1dfb SHA-256: 7b84709e4d8b4f625e0289d6e2a85ff1b086915ce021753855f5e46710217137
196 Risk Score

Malware Insights

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

This PDF document exhibits malicious behavior, as indicated by ML classification and ClamAV detection. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document prompts the user to install a browser extension or update, a common social engineering tactic. While no scripts were directly extracted, the PDF structure and numerous embedded URLs pointing to potentially compromised or disposable hosting indicate an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://novamakine.com/upload/ckfinder/files/77906406544.pdf In PDF document text
    • http://kpghomerepairs.com/uploads/image/files/birapewanolox.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/peloratuxotifapupiz.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/xajufajimel.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/f93fbda17042c2786b30cbe89b05c119/nubazubekogotiradiniweru.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/bdcbe2059db9b1fc7fe8b3f5e8c4c6b9.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021090201484273499.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/42549058198.pdfIn PDF document text
    • http://interiorsexpress.biz/dayafter/uploadimages/newsimages/file/4149397772.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b618af11d4---mekelefovulopilovusove.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/vufapawafakafamaba.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090802435893567.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/50402165918.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/mozuruvabosiza.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/kipopusejiwasuxab.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/bigiwizosufipatug.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371ba029068---bimolejebiv.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/semomepotipakosikupufonig.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/42344918831.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b200af4016---92390365920.pdfIn PDF document text
    • http://samtle.net/ckupload/files/73526624249.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/2078775534.pdfIn PDF document text
    • http://tfforming.ru/d/files/kapameruvugobojak.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/bb1d388afde226d99a2f4afbb6cd276d/90494230969.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/89229824891.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=office+doc+viewerPDF link annotation
    • 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_off0000d512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD512 10068 bytes
SHA-256: 907a14fbb40f07495c79b63f69fc9739f8518c72fea800d628490ccce0933ac0
font_01_sfnt_off0000eb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AF 21988 bytes
SHA-256: 90bcd6678e582bbd3b3a500ec45ab14b6c3fe35f0d9c614d8efa5a9a9eabe376

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