Malicious PDF — malware analysis report

Static analysis result for SHA-256 916b7610a371ede4…

MALICIOUS

PDF

82.1 KB Created: 2021-09-20 03:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 40aa29ec4abc740b898fc351b9cab386 SHA-1: 66f7450223896078b7ae26cf4f67e86c195a61c1 SHA-256: 916b7610a371ede4033470389b6c5b67544dfc63ea4cae1619892b4324405838
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS uploads or disposable domains, indicating a potential distribution point for malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://pizzeriadevita.it/userfiles/files/ziparabumimupajalujadukel.pdf In PDF document text
    • http://masan315.net/board/imagefile/file/dewujoz.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16131a566ef2d0---gogowoparuzakojor.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/mebozaxal.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/111049365322.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/motirapenan.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/gewin.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/b49ea431946105345e6bd6aa886f54c3/55990423490.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135addeed66c---22127815624.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/79516326458.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/norefanubogodafub.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/tefexumuwakiwopekesubaz.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/31416547501.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/sopelax.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/vuxusijaxasufijubibenujol.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/84751038328.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/34752979158.pdfIn PDF document text
    • http://alvitraders.com/files/kutapujebopogilaze.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/0fadde6f1185b04359b86207fb476da8/vugobosaduteget.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/didifugunizijulatil.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/naxexedivijidagefunotarow.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/58301555128.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/62045367802.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/seturuponajiwojusipusir.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/87c8cf3ad71d3d9d429b278cabfcd5be/69956416143.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109082129592682.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/47701240693.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=jass+manak+all+songPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6F 10112 bytes
SHA-256: a009cc8ecaa4c39166dc03df29874c5456c4765c06834125310ae67863353993
font_01_sfnt_off0000f1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F3 18868 bytes
SHA-256: 43c26c2fb0ea28470a8fdc7adef2f777cf1c8cc904e23ba3654bd15551f26007
font_02_sfnt_off000122ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1