Malicious PDF — malware analysis report

Static analysis result for SHA-256 1513299f7163ddbe…

MALICIOUS

PDF

74.8 KB Created: 2021-09-16 18:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: eb425a5852eef8fa499f31bc2cf0547e SHA-1: cd2f8053762dbc916b53265955a9003c95b25eb5 SHA-256: 1513299f7163ddbe299b44d500b345206ff725a715b60ad3e0cb04d2fd757740
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress upload directories, indicating an attempt to host or distribute malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1d7f40b50---devevijogonav.pdf In PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/486b3a783ee5fc542c5d919dae014fa3/kavirigireki.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/zejiwuv.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/xatuzab.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/menadikivofulubax.pdfIn PDF document text
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/kipasuzem.pdfIn PDF document text
    • https://awinresource.com/uploadfile/file/getefobukoraguwofubal.pdfIn PDF document text
    • https://praktijkbinnenstad.nl/file/10330950434.pdfIn PDF document text
    • http://domuran.pl/files/file/23839872384.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/xeketuwutibisebufapojelu.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/81261699372.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/25322324484.pdfIn PDF document text
    • http://www.toptehnik.si/images/mubusopirexixepotu.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/nedepijewof.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/71974361873.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb4d5d52fb---paxisi.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c92e5b98e---zoriripo.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/vamoxejufizuxixakuxapidom.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/pufakurulumoguxutanof.pdfIn PDF document text
    • http://tion.hu/upload/file/22372832564.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/disukasamusuwen.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/5740459383.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=calculator+for+android+wearPDF 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_off0000bf93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF93 10520 bytes
SHA-256: 9f01661de732dcf8cac9931cd910ca8b410d6ad6caf988ef054a529a44a5e583
font_01_sfnt_off0000d7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B6 17668 bytes
SHA-256: 5a5ae40b8cd1a0e591a59e700bf165b3b7b33f690db8f351bbe6a318b609e439
font_02_sfnt_off000105c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1