Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be93b5f8d330f83…

MALICIOUS

PDF

74.6 KB Created: 2021-08-30 13:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cc3a317beb82085377930e11f2bf843d SHA-1: a82f06a6b520f3103b985c4b73c7adeddef3f6ec SHA-256: 4be93b5f8d330f83fac9465030fbf36a436c0403a74c5f04bca00a36b50d0ba8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. The file functions as a link farm, containing numerous URLs pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=total+absolute+neutrophils PDF link annotation
    • http://kyea.org/imageuploads/63345720540.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/47213c006b20090c7c7afb6d2ea3253f/3307108029.pdfIn PDF document text
    • https://nhadatonline24h.com/Images_upload/files/juromubevonuzaruvudef.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608e82be4bb83---xenidudivemiwudep.pdfIn PDF document text
    • http://chikatere.com/Upload/files/fekemu.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/56237313169.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffd88ba5e9---depofudetes.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/javefa.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d9a5a5b8ec3---gogalovawutokim.pdfIn PDF document text
    • https://umartravel.com/files/wifejadojodas.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/23473786703.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/tobuzeru.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd2bc57e028---11636982824.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/2084436685.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/72881274713.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/35001881876.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/98993560415.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/zajurolatedewenegosiv.pdfIn PDF document text
    • https://wsbtitan.com/images/file/kiziraw.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16071b5d46913c---87671370723.pdfIn PDF document text
    • http://anm-av.de/uploads/files/worukiwosofujoda.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/zixuvipinerexibojo.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8618fbab91---73219504621.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611e7cbc3a38a---39144439362.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_off0000bd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD547 10552 bytes
SHA-256: 7c9230060ea6d0af456d5eaba2d361c10808a1c8c88e256e14e834d6585da244
font_02_sfnt_off0000ed0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0C 18404 bytes
SHA-256: aa68941490cab1a233ab0b0e4b9221f8363606de8c67626ce612d5a1a05d9262

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