Malicious PDF — malware analysis report

Static analysis result for SHA-256 9319686e510c9661…

MALICIOUS

PDF

81.2 KB Created: 2021-09-18 06:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: efb2b09e81c25f64636620cc6ed7c843 SHA-1: 32c4c23997ee4e106b852c83326b453561818bab SHA-256: 9319686e510c966134c14ac6feded67469a86b21d5323417ae6106fffa0e26fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites, indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution lures, likely leveraging embedded JavaScript for execution.

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 http://aczelzalog.hu/tmp/55991477773.pdf In PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/2069740638.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/31433658665.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109051944418071.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/zopugipuwapefogolezimagik.pdfIn PDF document text
    • http://twilaw.com/files/files/xolidaxorodasijiwosezafa.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/26629864770.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/jtt4epbdnlvsha57bft3is7uas/kanojino.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/15373123821.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/tavisugapovewag.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/99308119230.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/ziruneragufasil.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/84085527709.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/56055215744.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/94030411452.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/4c9d94c8a8317b793389ee1315be08b4/19587824674.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/94840698085.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613146bd2f789---54821510145.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/74899204958.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/ptp303r8gjnb6aibodnb9cg0ma/najuditipopijetifosex.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/90618891105.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/wuzogo.pdfIn PDF document text
    • http://th-hl.com///upload/files/polasoriwajokawape.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/gowibefe.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/7705304416.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=justice+league+snyder+cut+720pPDF 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_off0000d6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D7 18068 bytes
SHA-256: 5f9ffb6df949d4fa20e268ea1cc8c16a87d49996830a12f2ab84dbfc3a681c49
font_01_sfnt_off0001055d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055D 11068 bytes
SHA-256: 5022a888cef7612ad171d931330ac70825741652c87e5b015968bbf938b3bbf0
font_02_sfnt_off00011f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1