Malicious PDF — malware analysis report

Static analysis result for SHA-256 29918c91e791bf6e…

MALICIOUS

PDF

74.8 KB Created: 2021-09-15 12:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8e356112453b8789dc9f4c15391ea16c SHA-1: 840552cab1c6bf982b441ef00b8f5e2b1f00d3cb SHA-256: 29918c91e791bf6e95ec4469c590c69907d432db29be4f66e6ec27669d3cdf18
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and a link farm pointing to multiple unknown URLs, some hosted on compromised CMS uploads. The primary attack pattern involves directing users to these external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sinners-party.de/media/file/5880014281.pdf In PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/muvogifowadeketepapive.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/pasomonopozujate.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/vokiwuvorilavi.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/suwetojose.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/2697839229.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/18869604739.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161381d0e91612---gubojujifa.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/55432312492.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/mewasoviwidilidetufewuvuj.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/59083981009.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/bokef.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/1781e905b5f92e3d70a8a36a878d1e1e/71038185902.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/biritupo.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/92180561798.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/sukegifobixekumiloben.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/legilet.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/mamowigufol.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/56151611369.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///42400889393.pdfIn PDF document text
    • https://maviet.vn/upload/files/50943158653.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/jewitosizox.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613349898c95e---dexejujexotirojig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=leet+minecraft+server+mod+apkPDF 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_off0000bec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC7 17732 bytes
SHA-256: d2396ffc1fa45e89a74cb19603da893ed59e4ff48323f46feb082c736f4bbb07
font_01_sfnt_off0000ec96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC96 10852 bytes
SHA-256: 492b540f7ae65feb99015a806d91b984ddcea7d8912a3df34d680e409e3d0899
font_02_sfnt_off000105a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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