Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f872044913a531…

MALICIOUS

PDF

91.2 KB Created: 2021-09-08 20:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 38041f9f5549cbed522c839818eeac3c SHA-1: dc7cd38fe213de270de09aa56e07e0d85bba9c38 SHA-256: f0f872044913a531a9a4c979efc55f5155dc62bdb9d25e9fa57a0e3b798fb971
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating phishing. It contains a link farm pointing to numerous external URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://gancza-yacht.pl/userfiles/file/mekodol.pdf In PDF document text
    • http://ahzgbh.news-read.com/upload/files/kuxax.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210908124811_0hm26a.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/ruratilogalizok.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/jozusarame.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/filozijemegeguvotimofat.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/xaxasebuzakebuwixepanixow.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/17551447708.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/vidafevuzuxasizokopebu.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/lekakadadur.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/95784248095.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/kugivo.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/1533395808.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/44520116692.pdfIn PDF document text
    • http://thongthien.vn/upload/files/fisek.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/xatofobi.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/47665060470.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161380221ef6be---vixutoga.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161348ec7c9368---46749503822.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/sutoj.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/90390958193.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/vugejuperawugisetulag.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133ab4694393---31889618619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=manual+da+fritadeira+philco+air+fry+digitalPDF link annotation
    • https://easyown.ddproperty.com/datas/files/43066125948.pdfIn PDF document text
    • 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_off0000f60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1D 21056 bytes
SHA-256: d1ed9e37c8746f9478564d9531cfe125fa69c1bccb37ee7eba19ad07c7045c18
font_02_sfnt_off00014474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14474 10936 bytes
SHA-256: 22c7827ce2ec7f1757ebdd343fc2b6fd932dbf03f017d39b2e8c2139849bfe23