Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9d5f0f9cae3efd…

MALICIOUS

PDF

726.8 KB Created: 2021-06-20 15:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 94b2df60db916188a05483f3cdedbe46 SHA-1: e2501a97edf09307f73dd5f51c9f887a37dd3b8a SHA-256: 7b9d5f0f9cae3efd6500f9de8bd22cedf4948beacf1fb4345036e22661252fdb
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan variant. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's primary purpose is to solicit sensitive recovery information from the user. Several embedded URLs point to compromised WordPress upload directories, suggesting a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7396

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • 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.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c74442dc1fd---lajexit.pdf In PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/4280709712.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6a20a2e07---bimosepotafe.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdf6391369---62793566802.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/62372403689.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/76b9618df0a07fce9d68b400a9b02b89/zinopenaw.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/97u7dpe2opjia8bofg71cqt5ps/48298286278.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/83967258543.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050623073873499.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160818b985e68a---koxogoduruwek.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-5/20210605152335683453.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160963d4def320---wokoxoxapined.pdfIn PDF document text
    • http://waypl.pl/upload/File/gogoragijiwisinubonodane.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=elementary+number+theory+6th+editionPDF 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://scripts.sil.org/OFLIn 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_off000af20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF20D 5240 bytes
SHA-256: 0821a33b274e2e83ca015d183647d8dba6933d3b6f4f14d63b30b9182636dd39
font_01_sfnt_off000b03c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB03C1 13104 bytes
SHA-256: 51e842aceb89b0897026fa21eacdf7975f3a0fa7d412a8bbf73dd036fb3128a8
font_02_sfnt_off000b308b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB308B 16232 bytes
SHA-256: bdc21286594a69dc0968ca5bd99613de364be0f673e07e33298ba5ff8abf051c

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