Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfbcc4140345c80c…

MALICIOUS

PDF

73.9 KB Created: 2021-06-23 16:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 25398ab81d06195b7439afb3bd1db6e8 SHA-1: e1d7ec1f24cda6941647038d48c09dc4c4e7b0f0 SHA-256: bfbcc4140345c80cf0423c7d0ae54e083a618d6cdc9e8dc84ad298e10615fb07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The embedded document body text is heavily obfuscated and likely contains further malicious links or instructions, though it is not directly readable. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://incucinaconalberta.com/userfiles/files/69073746582.pdf In PDF document text
    • http://www.euro-fly.eu/userfiles/files/fisusabigomaditukite.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aaea7f996c1---65257041093.pdfIn PDF document text
    • http://tlproduct.com/userfiles/file/74120226845.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cc7ab0a7249---leforo.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/voliwopaduzakanasuzugiwu.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df3740fac2---xewofavedipopuzofi.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077850f5c80d---gakup.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/ce28e1b983f98d68df491e4cd059f09b/77128628324.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/60650018535.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a0e485f6b5f6314238f9cc4183ae2002/koledarenagivi.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/83357556118.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/35274622176.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/a5l6lgo6l72ogho7m15ob4f810/44966981556.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/ae572de364bd42cedfacb20699fa6fe4/pomolonavagipat.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/039ff620fe36cc7e482cac16ece155cd/depusufidovogapix.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f0396335d---12278848531.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/24385277751.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ace+notes+for+gate+eeePDF 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://scripts.sil.org/OFLIn 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_off0000be18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE18 4744 bytes
SHA-256: 3f147c2a385b8369ef40fe510ce55c908ce25caecfa74a6c295b24ce1aaee1da
font_01_sfnt_off0000ce32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE32 11668 bytes
SHA-256: a4bb0101ffa1bc8ffb0716cf5e3ebc99c84efc72e13732c350c7a7445c01d529
font_02_sfnt_off0000f566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF566 16164 bytes
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8
font_03_sfnt_off00010a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7F 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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