Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bd4436c8ba17d55…

MALICIOUS

PDF

85.2 KB Created: 2021-07-03 07:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 705c868d5f1ba6d2dc4482dfd46b28c6 SHA-1: 8996fdf1b882f0bf34e91607ed7d086da718ea54 SHA-256: 7bd4436c8ba17d553942585d879e2f33360bb5a86898b0cd4315cbe2170e24d0
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of URLs pointing to compromised WordPress sites, indicating it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with the 'Spearphishing Attachment' and 'Exploitation for Client Execution' MITRE ATT&CK techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=non+inverting+op+amp+gain+equation PDF link annotation
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/c77kqkfh6lmrpsunmru937hm4d/rupugukukuwemamonizelupa.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/pseo6uqogfs1r3cirbadsd1p82/nurusod.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61648b3cba---lemimokixog.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c67baf28471---3341449045.pdfIn PDF document text
    • http://afro-safari.com/upload/files/novurazuperiwar.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/rimetedatamunilurigarojol.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/c37b7d7542f1e5ae3215b6f0513dde07/meduwemugomi.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/d4f9256cb001f3bafa2f395579354cae/jobomukesopiniwoxafe.pdfIn PDF document text
    • https://technische-dokumentation-hoffmann.com/upload/files/63454628324.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/vodalesobopo.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/66370944929.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/27320378363.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/bf0873538aceecd60eb2bda2d18f3f81/17058891599.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/29405437623.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba1b1f2bf7---zizufu.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/okq3ib8434vrv2fnbpb2oca69d/88105077210.pdfIn PDF document text
    • http://e-hane.com/files/29856544543.pdfIn PDF document text
    • https://lesura.net/userfiles/file/94898059732.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609847dcf0931---49925684334.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076ffa1cd98f---filebeloganewokozab.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/bexowak.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/dobatesufu.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_off0000e851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE851 17920 bytes
SHA-256: 0f36af6063af0948240451cd98fe5b9490c0b1f1b63c41410868330e1c258401
font_01_sfnt_off00011765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11765 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7C 10672 bytes
SHA-256: ffdc714e58669d7a5a3354151121c23f8699bb9ce296ed9d60bbabcdc92fabba

Open this report in the interactive analyzer, or submit your own file for analysis.