Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ddfa442b298a41…

MALICIOUS

PDF

99.9 KB Created: 2021-08-24 23:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 30933736ef89366ab4831f9c42c4fc8d SHA-1: a37c926316a6ff21786b58312105c7ae91e974a3 SHA-256: a7ddfa442b298a41c3a6551a8632b69f49d16406c661b57fd677844b24bf1ed5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://krisoc.ru/uplcv?utm_term=divinity+2+quest+guide PDF link annotation
    • http://manpukulivermore.com/uploads/files/47590392828.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/posenixiganekofururajupu.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/natujasatinorapad.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c98ddbc8d22---givonaxujibijo.pdfIn PDF document text
    • https://mmszke.hu/files/file/40108036541.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/49588171367.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/45528989229.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aabb7ed5d22---lamaputumogebolasale.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/35573814931.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc8715d6b9---54189144112.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ceb7ce1fd---nepuwofogukiwin.pdfIn PDF document text
    • https://soltendance.com/stockages/files/66056463661.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/dfa3ad22437266aa65428bb0ef123b3f/82256515357.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/49628147827.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/dotunokumubitovijuvo.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/92088227562.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/783ce43565249c392f030eb98ddcabc5/29073781030.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/xirepepagolinaxupafo.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/ginovizixunaj.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/8383874290.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/07/09/file/mosigufirelusasejinidib.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_off00012524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12524 16700 bytes
SHA-256: 8b27d6945d3456ae4139320d3dada318f43f6bfc209b8ab133b76eec712fffa1
font_01_sfnt_off0001508c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1508C 10540 bytes
SHA-256: 9db82da431b71a7a0af9e4a138b3454e0261a0c7efa2b9e724e8c4aa088c7ed7
font_02_sfnt_off0001684e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1684E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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