Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc2b590fd7797e38…

MALICIOUS

PDF

87.8 KB Created: 2021-08-14 22:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 634c69b581314f04a4dcfd77192decf7 SHA-1: 1dd679c96b4967eefe5ac4536f0471b5d938a9ab SHA-256: cc2b590fd7797e383349e9d3bed9596e99d3d7addb326e9aaed7307f5aa16d01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or phishing pages. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document's primary purpose is to redirect users to external, untrusted resources, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://synerhu.ru/uplcv?utm_term=novela+os+dez+mandamentos+2+temporada+capitulo+62 PDF link annotation
    • https://megalightgroup.lv/uploads/files/61689015448.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/dadibufuluxagegotu.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608efdb84db09---tololomorojawat.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/82380505745.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image//files/63699890175.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/4b9a1fdd30291e6983e505b596f0e664/40848934380.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16075b1a904492---bisilanesep.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/vopedadoj.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/givijizudega.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/29151577331.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/87019439322.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fdf7b3886---66774643346.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/41454440666.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/74607396518.pdfIn PDF document text
    • http://www.asslar.de/downloads/rometiwu.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/nezagulebij.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/rafefuritesubezopux.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ac3cd205a---17628598537.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/12322153650.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dc4fce0cf22---91096781255.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/jumelonabanif.pdfIn PDF document text
    • 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_off0000efaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAA 11164 bytes
SHA-256: 8ead93153a2ade63f9bd14ee00a0b87141a73a7c425ab93fcc91b5e3b2f9af6e
font_01_sfnt_off000109d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D3 19396 bytes
SHA-256: 2f472a76821f90debe41063efc70b921c5c04f2aa46d4dfc51c21f248b7d2891
font_02_sfnt_off000138a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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