Malicious PDF — malware analysis report

Static analysis result for SHA-256 201f60f70cc229ef…

MALICIOUS

PDF

70.4 KB Created: 2021-09-16 19:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5b15fc10e5f8bbeef2285fa936ccab07 SHA-1: 38ad12ff5f8050516dfb93e0e3f5bc77785eb911 SHA-256: 201f60f70cc229ef6cb08ee0f7071f500fd6c9d5f4f8604822386856bc77b0f5
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 disposable hosting or compromised CMS uploads, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sanruouvang.net/images/uploaded/file/83419471897.pdf In PDF document text
    • http://nc-israel.ru/upload/files/26629864770.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/48959942396.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/62496713992.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/vilajelebojojodusal.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/49385540882.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/vivenulugox.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/69552896389.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16142a61b92cbd---kufusejewab.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/lasenopajawituteseloni.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210911_93791E633B5F4E18.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/5abs4v8acbms8g7rejvlfr6dgv/jozav.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109090636152287.pdfIn PDF document text
    • http://rayanchem.com/d/files/8421479018.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/vq4udu40evs5th8efc31dfakpq/50436221400.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/topojefuzawizadupe.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9981161457.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/626176190.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/wefarosanidoduka.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/45907376513.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210909065444.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/79180451249.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/92129046758.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/nadupafozeti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=download+paid+games+for+free+androidPDF 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_off0000b46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46E 15320 bytes
SHA-256: 69cb90fbf0b73a660ece1b2dc0ef0a200f9c83d0c228de8f94205f14280841bb
font_01_sfnt_off0000db44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB44 10828 bytes
SHA-256: e838105591dc9d08021cb9b7727d83b4145c52b5adb35f6dc221862f6a7061d0
font_02_sfnt_off0000f401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF401 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1