Malicious PDF — malware analysis report

Static analysis result for SHA-256 6de36c2b4a80f607…

MALICIOUS

PDF

104.7 KB Created: 2021-09-06 07:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c7e54a51f7a85763fbcdce3ae1bd804b SHA-1: 78b56a1dd083f92abd7d6e30b761c5f80ba7bb53 SHA-256: 6de36c2b4a80f607f9d03cf340af902cd2ede028f13fcf0ad942777ca0672dfe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to lure users to external sites, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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 http://chizclean.ru/files/fck/file/wekokezet.pdf In PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/buroxu.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/81325954111.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16095ab6a671ed---sepokejufalolut.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/budelisejuj.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160db106a8be14---pajazufulirusa.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/76231853843.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/badefibawetezefitufasev.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082df57c1f0d---97643253819.pdfIn PDF document text
    • http://amandamaitland.com/images/file/36917843462.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/79293539042.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/roruteg.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/fudimuninada.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/68305608110.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/idvu4k3sc40200rljaac6mnhs4/ralovabesunefamikifupu.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/b2b026661566f37febf75c3a000736c7/84537759092.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160abfa4b263ac---36670132660.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078faacbca7a---nojojogavo.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/pexepinixodibirefexexori.pdfIn PDF document text
    • http://usmleworkout.com/files/file/28346573086.pdfIn PDF document text
    • http://zuche0551.com/upload/file/9583200721.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa9be7bc2---15898810333.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/15884744585.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=terjemah+kitab+kuning+bahasa+sunda+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013710.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13710 27484 bytes
SHA-256: 5add2a42040c776b34ce74f528ca0a21cd7926865aa88e5de67247e113446280
font_00_sfnt_off00010564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10564 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7B 11204 bytes
SHA-256: 9a3a5c26376d83e386ccf31964e2b5b98503cc828b9fa55f8ad52ed045fe72b1
font_03_sfnt_off000168ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168EA 16712 bytes
SHA-256: ef0e6944fbe399cd84287538ea2179059ec3c45b0c00cc901a35210108747f18

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