Malicious PDF — malware analysis report

Static analysis result for SHA-256 b65947fda729560b…

MALICIOUS

PDF

72.2 KB Created: 2021-09-01 20:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4351b00daf22f59ea52c439c74a4d3dd SHA-1: b2fec445031339e5ec730070f025e049e7528370 SHA-256: b65947fda729560b867d72683b75358b3ac772020959a81f33eed4293858cd0a
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather to host these malicious links.

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://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e0e9066802.pdf In PDF document text
    • http://alltechsro.cz/files/jemadazo.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/ruzutetiwexopejifege.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6ab4f12af---diwoz.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f168379ea---jefibuwivijefunaziv.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/6796694ffb8654fcaea356e338c82bba/35493340795.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80c0fb3d6b---ximukoniki.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/jafovikizedukiveku.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/b114b048133fcdef48d57486c22f7524/15799263484.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/58951061604.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210603_BBC4F32158883252.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/fitejuzabofazomalepusid.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data//files/5082004898.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/92619eeccce8e1c92b32cd0f8daa46d8/wemimaxab.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/26748205677.pdfIn PDF document text
    • https://tavio.ru/files/file/tazawogedoj.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b57d32f63611260f459e22bd11c4e2ef/54687752757.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/poximu.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/dezutapikulemunasam.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/5504944063.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/26535368470.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/fixisapakosemivokad.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210728/file/kosejola.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/kanatorovidexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=hygeia+integrated+healthPDF 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_off0000ba08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21A 16380 bytes
SHA-256: 23f99d989c35e61b5a2555edc75c1b25f10f1291df8f3a6e30e887e389a87d52
font_02_sfnt_off0000fc6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6F 10344 bytes
SHA-256: 919b825a84a20ba8ebd67ec4fbbe2b261e0481d4bf39381ac89d7b0e1dfbb267

Open this report in the interactive analyzer, or submit your own file for analysis.