Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e01e807e7a8d20…

MALICIOUS

PDF

72.4 KB Created: 2021-09-02 06:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f3245ddfc0c26e27cfed9940293d2871 SHA-1: 9c59edcde029a1ab030dab81ae76979111c9d62d SHA-256: 99e01e807e7a8d20f244edfe187b678fa759079a7c1009c142bc10d5135d52e1
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://simondaulte.com/ckfinder/userfiles/files/xoniduvazus.pdf In PDF document text
    • http://easy2ticket.com/upload/files/72328705267.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/pexejitanu.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/kuzonawiditoxede.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606f29793ea7d---latofexidemadefi.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/85949250973.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/tibopikidudoze.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/b5hsdllrucbksj564loamcevc2/41322111399.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/5708956564.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/gurapesamotipatukitawetux.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/51967877640.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/30083156765.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/monijenurepozidadazupomur.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/zefolakeponu.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/85338434013.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4a8fe60ee---wojumawebul.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zagavukar.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/betilekufitup.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/newarerutokejelukuriwapod.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd2e7a5567---nerusirazumufefu.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/257807biguqk8l7kpl9tjjir81/simulonedovobamirox.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/lopapexun.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/saxowanabipok.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/e5b99aff217b56b160b783a34575335a/65113118235.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=write+first+three+common+multiples+of+6+and+8PDF 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_off0000bccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCB 11352 bytes
SHA-256: bd7fe36782fdee74804e2f74b8294c810c892102c668f9a7f28c33a5bc558e8b
font_01_sfnt_off0000d75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75C 14096 bytes
SHA-256: bb6174146bf29d64a1c3be37cf93f1892e549d2717377550b8e5e4bc4278d467
font_02_sfnt_off0000fa68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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