Malicious PDF — malware analysis report

Static analysis result for SHA-256 89198d5ea82bac38…

MALICIOUS

PDF

77.6 KB Created: 2021-08-31 15:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 97c807b178e5d514ecff87c97503e900 SHA-1: 40e169d39fd2c7dcdb75c851b5b9787eacf388ee SHA-256: 89198d5ea82bac38005885dcd3914869d94581de696833fe61191d20c7fca2df
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, likely intended to trick users into downloading a password-protected archive. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document provides instructions for accessing such an archive, a common tactic for evading gateway security. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://catamma.ru/uplcv?utm_term=quotes+about+pwd PDF link annotation
    • http://katachizu.com/img/news/files/76158396588.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c89410947---sesusosobuwopupezasowale.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/9d7401fb1ca34f3d3f4f09dee7748744/wetotatofugofi.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/25518569919.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cf0a6d57f---dobimotuwulunasawunawu.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b649702a472---99127484566.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/63874293069.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210629081353.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160aa182a11101---75842272373.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/28983383573.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a500c3fe9f---givanerinud.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6c9faee25---gasudonukaso.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/38287e167e0147cec6aed105e57f20f1/67072749088.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/4ak3er6v7cob60bq2atir8oe1c/mupeli.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/69191648836.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/maxorolunus.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/ruzaleparijasizudazorijod.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/62103080631.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/24964337823.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/sojesawobanivorirutotol.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/murejejikugisiwonor.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/d2698580dd4d16f91fe2111446ca91fe/85301761992.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/zuguj.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/zifetotumej.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/94589605660.pdfIn PDF document text
    • 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_off0000c953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC953 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE165 17988 bytes
SHA-256: 82d7b975cb4996184f1117106c667fb688e7377bef16c3acb59f1a32b726aef4
font_02_sfnt_off000110cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CF 10428 bytes
SHA-256: 8a808e12208da6dd89d9e36c87c1051d132e5b7bef4025f1e6f5af85d6a30db7

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