Malicious PDF — malware analysis report

Static analysis result for SHA-256 1938a7ef9010a445…

MALICIOUS

PDF

68.1 KB Created: 2021-09-29 04:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5930f261e6f48bf0cebfcc32a52c835f SHA-1: bd139cc069ef74010b1bacdc72495cb40330a9eb SHA-256: 1938a7ef9010a4459f8df8b48306bb503b8f3a29ef5b9c94b158cd55771013df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, likely intended to lure users into downloading further malware or engaging in phishing activities. The document's structure and embedded links suggest an attempt to disguise malicious content as legitimate downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • 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://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16152858bd4c5f---mimegana.pdf In PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/tolarado.pdfIn PDF document text
    • https://whitesal.com/data/images/file/1367_20210916091223.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/paxufatawewisi.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109170103151498.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/lexolozodujamawawu.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/s5gn05spgahv85q59ca0ng42d8/38597836826.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/takiwe.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/nibujajel.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/6710013620.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/lalososove.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/25008059572.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/8471219389.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/13906125798.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/fukilesojukegup.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/dodegamo.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/96673200595.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/15619287759.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/bebb7c38548a3c2a7d8b18313836407a/ruratexuwudemiko.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16150c1f0e2dc2---lukamara.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/vibaxonuvomapiwabovesazob.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97808501362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=demolition+derby+3+apk+downloadPDF 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_off0000acc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACC3 14864 bytes
SHA-256: feeb8edd0c39dca081de40623badcb980f65fbc569480c6452957025d9e25e70
font_01_sfnt_off0000d1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C8 10988 bytes
SHA-256: d3de21acaf9549099912dca68a7c655e72d414df26cb1a0e4412f817f9221696