Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2db5336a9a66c12…

MALICIOUS

PDF

76.7 KB Created: 2021-10-04 16:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 367c81a6948f8ff65072a3a8ea6991c6 SHA-1: e6d157d1c2cbf3c5ee967b80c0d16777b779b8b6 SHA-256: d2db5336a9a66c12289272898db29cefee812b9177354194e263da9a90863e77
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites that appear to be part of a link farm or hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://protradingindia.net/userfiles/file/xovematemegabone.pdf In PDF document text
    • https://netkat.in/ckfinder/userfiles/files/torokibalidebuvopipud.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/34836489935.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/pogopexasam.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/denezimemozuveripavemebij.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/varoguzifof.pdfIn PDF document text
    • http://cbstav.cz/file/ponuwokogu.pdfIn PDF document text
    • http://indemo.pl/Image/files/potosubalovoxi.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/15842136645.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/31377021041.pdfIn PDF document text
    • http://rentaruedas.com/files/others/33148300105.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/zamidatadibip.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/52613152019.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/buralikoxitixapazaru.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/33004913819.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/lepozakosexositidu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614698e691c1d---43343493198.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///pofejopudamuzezejagib.pdfIn PDF document text
    • http://jamurgoreng.net/contents/files/23557038023.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/3ec28025380562249dc6e5f83d387746/76036714005.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/tonotirin.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614cd11417f46---kijidobawom.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1631371748.pdfIn PDF document text
    • https://magic-ray.shop/uploads/files/49118908857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=sonic+the+hedgehog+knight+of+the+windPDF 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_off0000c868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC868 10532 bytes
SHA-256: 8efbbbb41852b80445386683b756db5bc32343e62073920aefeb27cc3f5c8bc2
font_01_sfnt_off0000e032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE032 17484 bytes
SHA-256: af164ceb9ac189773a0824499622d1af2a46aa34c8ac96e3e9c0fa090d42802f
font_02_sfnt_off00010d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1