Malicious PDF — malware analysis report

Static analysis result for SHA-256 273651add2767349…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 08:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b3c72c35abd6ec8b621e3c0cf2f845a0 SHA-1: 0bfa7c190e74a05f673cc39aa12cf14592069fe7 SHA-256: 273651add276734924b0f73bbfeb20b1c6503a83d792ac17bd1b0399de4f6d6c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS platforms or appear to be disposable. The primary purpose is to redirect users to external content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ngoctraithaibinhduong.com/uploads/news_file/mikinibikudazozasiwowuk.pdf In PDF document text
    • http://baharev76.ru/userfiles/file/86567047260.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/1983959080614322009c534.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/pikonudewimowudigipojewul.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/pafevefadovunufidipusawi.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/xiwezovazivunavevojoresam.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5feb63573---tolunenivotekafiv.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/6149aa138c0bf.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210914141852.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/99147172243.pdfIn PDF document text
    • https://orrizon.ru/images/file/nafuxifogaxotikogesuwube.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/nibekekiwan.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/pixewuwi.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/53062344868.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210904171300.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/mudivulakuroxijafazowu.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/f6159cab348035c194f3f90f5c83df07/kilapuzogosojo.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/papuxojigawukubo.pdfIn PDF document text
    • https://panoramabyty.cz/content/boluxikoziwitatafoxi.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021911524245352.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614679c00fdf1---7954308438.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/rukujabanurofe.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/likopak.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/4425556581.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=the+vertical+diet+%26+peak+performance+3.0+ebookPDF 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_off0000b393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB393 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAA 10104 bytes
SHA-256: 977fdcd7d8b27a1493c6de32b3035e2bbebe87fbf7e8a09e37175a9c64916ea1
font_02_sfnt_off0000e24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24F 16768 bytes
SHA-256: 17c96dfd3c8ac54b9270265c821c7f7c8e68180734f13d68a94d6ef08ef2656d

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