Malicious PDF — malware analysis report

Static analysis result for SHA-256 c054b9d84c4ec1ca…

MALICIOUS

PDF

68.6 KB Created: 2021-09-28 14:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8569a4f7047e3f30acfbb78ea0955621 SHA-1: af81e47e0c1c45a59153b0ddcb20515df9f0cf30 SHA-256: c054b9d84c4ec1cab5f8fe061b2babfc65501e4a7fd79a7982f83af0de5a66bf
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://theptaynam.vn/upload/files/12554868676.pdf In PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/78561960508.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/30089401842.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f81cbee0f7---20306804093.pdfIn PDF document text
    • https://laser123.com/geektic/files/56856922915.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/94287673204.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/suladonigetewukej.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/vewal.pdfIn PDF document text
    • https://fivetc.net/uploads/files/dusosufesuzirutorafimor.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161414ceb48ce3---43006128421.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/1684100697.pdfIn PDF document text
    • http://limoride.net/gallery/file/86720767167.pdfIn PDF document text
    • http://topp.pl/_topp/file/23108007714.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/liforusofod.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/buxonaxalosumo.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135dda8f0b37---69117000782.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/46726033641.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/wolov.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/8a2cc3e400e62a180d479ecc085afca2/pafesisebuxaf.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/jesisupefoxi.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/14893013606.pdfIn PDF document text
    • http://fourfoods.com/images/files/newofivurovizowuj.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/zanaxuno.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/wosixokomonos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=bully+android+free+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_off0000afd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD2 10432 bytes
SHA-256: 6b45c23a141a93d977c6ed70f0acaa3f76959f456b846b8cedf6b36deeef9afc
font_01_sfnt_off0000c79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79E 14780 bytes
SHA-256: a15957036b27ccb4ef1ca31bb4cdb80251c67f70e311920db4f42cf2a6eb195b
font_02_sfnt_off0000ecc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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