Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac9cd4ff3e4f585e…

MALICIOUS

PDF

74.5 KB Created: 2021-08-17 22:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 536802375983b497c34a58d6168c8b1e SHA-1: d46ca10f4cd4bfffae6dbd169c6f27268d98ba94 SHA-256: ac9cd4ff3e4f585eaf330eb6eeca68e002dfd126788b712bfc98ca128881bd88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations, indicating a link farm designed to redirect users to potentially malicious content. The presence of these links and the overall detection suggest an attempt to lure users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f22221395---zofirukurutekipimifa.pdf In PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/3hf8g1kude2dj5951kegv1seg2/pizafikokudelusam.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/57780393877.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/e64em77vjedkrlqupkleqrf0c4/63242507372.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/fawen.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16114084b42dfe---12387160693.pdfIn PDF document text
    • https://ilmercatinosottocasa.com/file/rajojiku.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3a367ff7d---tutinogapituk.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/bavokirajixawonomisig.pdfIn PDF document text
    • http://askort.pl/Upload/file/49416619569.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1f1af2582---kuluvejufizidalajatekif.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/gekugipen.pdfIn PDF document text
    • http://lgassociates.in/uploads/28788769391.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f63e8d70cb---8892039691.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/81519233273.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/pqfb7u2ls9uh7i8u5tjouutgim/66524114132.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/99059648919.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a86f41488---xumikurowipe.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/fiwivozirujuvigivutaf.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/57959669954.pdfIn PDF document text
    • https://toocapen.com/files/gasabudirakuvafexedatoxe.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/vevojo.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/toxobub.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/bc17439752425e2acf34e644e42a9322/40408357677.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cb2529d09---24977986264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=hello+brother+telugu+full+moviePDF 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_off0000c117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC117 16304 bytes
SHA-256: feefec89772baf72e691ce183807bbb7e875fc3b1a9c55eee8f93192f00cde6f
font_01_sfnt_off0000eb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001036f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036F 10524 bytes
SHA-256: 55c90d2b6ca9a179845a7ca037eb94e4a22924c0f8edb4d9d15bcff39ac0c8d2