Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4a0679d2de6d55…

MALICIOUS

PDF

93.4 KB Created: 2021-08-13 09:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 64f6908fd1ffd7552833bc3ba49203ec SHA-1: 021abffb7b6d888ff9a9ec5e9a651e32395ba52f SHA-256: 3f4a0679d2de6d55371ad534d874f6d3ee90f758d5223293e17f3ea7d5b8fb22
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9726

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160771959c75ba---78594227382.pdf In PDF document text
    • https://kingcarmotorista.net/uploads/files/momodenowo.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/gidozuxodales.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/47026121210.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/29422571289.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/f9906b15db5edfdc0fc884e333d3a10a/45568544011.pdfIn PDF document text
    • http://distributoram.com/files/file/7186863951.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/51670386284.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160958b78cfec4---towomizinidiluzop.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160980fe2381ea---13522900110.pdfIn PDF document text
    • http://teerosy.com/ipp/images/uploads/files/39506549939.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608885e5bbaf9---nuxepevowuxakivedil.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/d2b9d60473f06bf4747df87c93d832db/vazigakana.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/noselanuz.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/13cad2ab6bc2afa1afb1695fc266dfb8/luxufar.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b053e00f5---4499452111.pdfIn PDF document text
    • http://195exim.com/datas/files/49761742818.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/bugozizemojokoxobom.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ab3d5e11---xebuvizavujuvimoxax.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/mokinoviwapidig.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ff3fa6391---51037212076.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/6690a769f157dc2be5656ef3ea15da09/dexudidi.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/16016433283.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/3b1e6e98ac6b3c6b86e31030487f4eba/57963042042.pdfIn PDF document text
    • http://theettiaresottawa.ca/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/rikapij.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/44013004504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=journey+2+the+mysterious+island+full+movie+hd+in+hindi+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAF 16532 bytes
SHA-256: a1139abb4f3b21211356fda59cfecf32af06981a374c25ea2e3d8c4230e41558
font_01_sfnt_off000103ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EE 11096 bytes
SHA-256: e0fdb0977293e103d920d883292a47254da54326a078911da44df5a1bf2cfa99
font_02_sfnt_off00011dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC6 17604 bytes
SHA-256: a5557356109e9e6519f9bc4805807b52d0b131e636e95e5f17ebbcfc0158cfb7
font_03_sfnt_off00014c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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