Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4151cb8c8aa7510…

MALICIOUS

PDF

86.1 KB Created: 2021-09-21 02:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 035bf82b7def3e098e52e9395f3b135b SHA-1: a0d4516ef4592160bb0040baab5694324a164d72 SHA-256: c4151cb8c8aa7510baabd467dfeb0c4121e29e3d74867589f47f30b150d01b97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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=top+10+logo+design+apps+for+android PDF link annotation
    • http://marcobernini.it/userfiles/files/xorolofunonaxal.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/dinedatitisozolawaxamatul.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/42120737594.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2723168920.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0197ae49960980080bb0584f7558f0a4/kixusubosetina.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/498ebfc690e9f636a055426373a62281/32868524968.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/pijujigikonadurafut.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/lilobifazinumofewuto.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/petolidonimodudeluzuk.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/xerejulijimejedikedus.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/lezimovaw.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/22111294254.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/zezasatewivajejapuvera.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/wewuvomorixuzoduziko.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/41907612795.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbeda56921---mozupavarurewif.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/vumeke.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/wepuwodiluxabit.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/jajopokulavenota.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/kezobafaxep.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wixevusedogabin.pdfIn PDF document text
    • http://normel.org/files/upload/file/vukulitukexebapuze.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/wafoxitotodiresuv.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/39797456186.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/26102739467.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/mozuwufo.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_off0000ecb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB9 10712 bytes
SHA-256: 020684a124a3d1d707aebb8edce452b01940a2a502cdde31acb42ede7b0f7026
font_01_sfnt_off00010531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10531 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D43 17576 bytes
SHA-256: 4220508a3869d5302b97fde93b173ce67b6010effcac9fb41afa20a6783b9dec

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