Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa20383a13509adf…

MALICIOUS

PDF

82.1 KB Created: 2021-09-07 14:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d45cbbf1d198fb090063eea63c994070 SHA-1: 80b4dcf36ebdb0322fab231a44973dc2c2207647 SHA-256: aa20383a13509adfbe5659340a859fba45cb069ab0521f142e121a0f53becde7
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites, suggesting it is designed to redirect users to malicious content or phishing pages. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, likely to facilitate further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=gender+studies+glossary+pdf PDF link annotation
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/a3268bccf38d38168b76f31356c763ea/8889392696.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16095d4f31c9fe---baganopagafisafefew.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a53c352d07b---peweviv.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/89087132370.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/sigagewipilukoninav.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/79d14db5a7d8be1a4c2bdc58a5d9158d/34460686071.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/rujekurabutugogewepanupa.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///52269424164.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/98289919109.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/lukiketofunekubodane.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbeae61509---gugakuniti.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3903fe5cc4---41059971854.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/mavosaxete.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd642979987---nefogapomosurevabozonu.pdfIn PDF document text
    • https://ckmandarin.com/uploads/xubaju.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eba62b35b5---mamavomuzelumefenep.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/gukepijapupofurufeso.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/birusaxanikeredu.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f8cfbd76b56---41530046281.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/24503611578.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/8165177185.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/28713296017.pdfIn PDF document text
    • http://hodori247.com/uploads/files/22030890505.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/sujibizobi.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/kezulurimetozizaxixed.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_off0000dc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC38 17640 bytes
SHA-256: 6dae837f9be0ffac95fe5623850cfb32d06a655f862e332710fcbc0ad3668ffe
font_01_sfnt_off000108c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C1 10928 bytes
SHA-256: d4197201d43e97d43b362344df5f23cbabd7fe53f48e0530c08caaa8831eb5aa
font_02_sfnt_off00012209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12209 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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