Malicious PDF — malware analysis report

Static analysis result for SHA-256 69cbdc44b0cdfb16…

MALICIOUS

PDF

73.3 KB Created: 2021-09-19 07:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cc102b807c7f7398f0f3544b10954994 SHA-1: d17f0134e4299374d83791d34a97fe28f51de124 SHA-256: 69cbdc44b0cdfb16fa50f723804c8f7ed13f5ae21275590029569c132f9ea3df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple domains, some of which are hosted on compromised WordPress sites. The document body is unreadable, but the presence of numerous URLs suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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 http://z-him.ru/userfiles/file/sirivirufuvukelirewun.pdf In PDF document text
    • https://whitepalacegrill.com/userfiles/60090846909.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/tanofagudogubezanaw.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/b97e0ee4669783691b390ae38435400f/77397535982.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/3646010191.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/54310251514.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/39060091249.pdfIn PDF document text
    • http://bollnas.boj.se/uploads/userfiles/files/tokafutixe.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/kejebexanukirib.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/87682640354.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/81551410153.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/87520430250.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/7929404139.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/dinupevelitazejirerun.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/70262895504.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/gukebamejanuvowodeta.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/xitetekixaluvuxag.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/16571591487.pdfIn PDF document text
    • http://quangcaovuanh.com/vietkiendo/upload/file/pejopiziragigavun.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/09b8fce08c634095d54c832ee2a47e93/3770427033.pdfIn PDF document text
    • http://www.bash.cl/media/file/bileralaketi.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/489168089.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/18177194730.pdfIn PDF document text
    • http://konyanincigkoftecisi.com/userfiles/file/kamidafisipolub.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381b2974f34---46691861373.pdfIn PDF document text
    • http://orthodoxnews.us/file/jilugagaludibipiraxutux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=slide+menu+android+tutorialPDF 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_off0000bc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC6E 10416 bytes
SHA-256: ba9c9b32fb3f13ceadbbc67ae4074afb7141e579300205867f5c1925c3461483
font_01_sfnt_off0000d3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F6 16576 bytes
SHA-256: 416e0d7749f6d6af52eae3445c599970de2b2a12fed132eaadfb6c2aa1d66318
font_02_sfnt_off0000ff05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1