Malicious PDF — malware analysis report

Static analysis result for SHA-256 498f843a83d52f44…

MALICIOUS

PDF

91.5 KB Created: 2021-09-09 15:34:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 95db4d2e4ebd68b40e4dd602365313ef SHA-1: 46e5bde681d871cf6da2bd22f5ed08f51f9d1516 SHA-256: 498f843a83d52f44b42c47114cae54362ab8d6ad2ee9bb4fcf7b1853501966c3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The primary attack pattern involves luring users through a malicious attachment to access these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://2222.netsociality.com/upload/files/wobujo.pdf In PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/61752450091.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cba6ba688---zoxafu.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139fe12b7d93---41338887292.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/3f0cc012a0fc70a526c3731789e27b4c/govufifajeredesoz.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/warelepegewomowozubafi.pdfIn PDF document text
    • http://midospa.com/upload/files/telogokogur.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/maxituvejobovujowedexirez.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/87290538128.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/20614181399.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/95600593071.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/galavolaroxovobi.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/kapifaz.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/64010860049.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/juriwu.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/jojowom.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/gikiregemepudivupuzo.pdfIn PDF document text
    • https://ctyhoanongangiang.com/userfiles/file/jezowujuguzeso.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/83012930885.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/xulivikuzujilojebupoxulum.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/62986318030.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/faguma.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/rozexijewoboset.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/79662904464.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/92169473452.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=free+cinema+hd+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E9 18416 bytes
SHA-256: 6028f7275834a842e6e8812f42209551c3381d5192c510416bbe7be04f0faa38
font_01_sfnt_off00010245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10245 17880 bytes
SHA-256: 6c86ebe38f93fd03d0ab293e3d32820a6dc3466486d8384048bd40850031877e
font_02_sfnt_off000130c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C3 10416 bytes
SHA-256: 4b53b53abaf35347a73e904674a771fda6dfb61669036a10ad58d1bbf0ffd0ee
font_03_sfnt_off0001480b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1480B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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