Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e4a045cd673857…

MALICIOUS

PDF

80.9 KB Created: 2021-09-15 23:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3ef01f175e3def214f78665228976a61 SHA-1: e9684f7911f456d35573ab0dbc9c4f705c6913b3 SHA-256: b5e4a045cd673857aa3fa5c1a487782b44ada1e1fc0f0cbc596f5509319f37e1
164 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/vavegixuzepinufesevu.pdf In PDF document text
    • http://hoaisonland.vn/upload/files/liveboxediv.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139059dcb95d---wiwemenaz.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/rirexegowuxigixu.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/lizikunokavigin.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/xawelesezanujubupuku.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/80322541980.pdfIn PDF document text
    • http://llux.vn/uploads/files/dedeku.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/38660467866.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/fc5eb85492e33ad7263693694222295f/lajisotezesepujoxa.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/wodifigazesope.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/70141351798.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/87680265929.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/geririsojuz.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/95013302888.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/kejakijozopuxodi.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/70870457644.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/d2c4d16492654b7bbf9e96ee72c96f05/58262821038.pdfIn PDF document text
    • http://slsnn.ru/content/files/jajupu.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/bunesejatazidugavirerad.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/dbe9fd18058fd00a770bd9552dc4426e/vosasibog.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/vuborulisegadipu.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/27205130762.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=samsung+on5+flash+filePDF 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_off0000d81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81E 17460 bytes
SHA-256: f72a5ab13ea9ef6c3c58e65762561282007baeb86dd787d40e2faaa9131c9336
font_01_sfnt_off000105ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD1 10772 bytes
SHA-256: 3604ad8bdba298148cebdef75c48682c3c906e5005a1ab3c31dabf9b7b365283

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