Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c7edce88fb06a49…

MALICIOUS

PDF

110.4 KB Created: 2021-09-01 19:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ba2dfb950f6dc39ecc0673062a701271 SHA-1: 34333727b0b5ec26d04bf26f37ca63181414770c SHA-256: 6c7edce88fb06a4933c2165c69bd86135c73b1f03be005db43758a958ecea182
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggests it's designed to host phishing content or redirect users to malicious sites. The heuristic 'SE_LOLBIN_RUN_COMMAND' further supports the execution of malicious commands.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://gdlianyu.com/uploadfiles/file/josurimesizuxepulimifun.pdf In PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/55814833713.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/32301678737.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/liguresoxubakeguzesazole.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/90193550990.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/jlo84q4e46akvkg0nk5feo95n1/digelagupipe.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ng7968acqf8mk4qbqifujbuavm/tatafigew.pdfIn PDF document text
    • https://triosms.com/userfiles/file/1412788033.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/xogerafaxila.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d31fb89d7ab---gunun.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/20113010300.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/24b5aaaf5d428f5ef25ff4d5945dd35a/11293005998.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/3574737659.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/gowawero.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/20804172733.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/fakopaxarigorofawapine.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/0f1f9ef3f95e4ebda9712d921014c9df/makewalureroxewej.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/xuparewojebepugakogibiruj.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/wewofaribot.pdfIn PDF document text
    • http://berkeleyhigh64.com/clients/9/99/99a482d4bd0dc5522cc24ea7f8204a07/File/38313102561.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/redox.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/77ek8k4lpbfe4dlncmd1kehv1s/makubilarana.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/rvmk8r1cp0hshrh4i3nd39n7sg/luvumolelanewewiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=isometric+drawing+tablePDF 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_off000144bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CD4 10892 bytes
SHA-256: f76b2864ef0ec9c8a2006649559c8243b8bfd2c432981727dcdbac55642041fc
font_02_sfnt_off000175d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175D9 20448 bytes
SHA-256: 211c459134a9fd8cb24048cb45934dfe058c328dcc994a83b9ac37b13acd9e8a

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