Malicious PDF — malware analysis report

Static analysis result for SHA-256 c32ce32112f7d2f1…

MALICIOUS

PDF

82.5 KB Created: 2021-09-03 06:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 35788ebe172e5c38236d653b4b43240c SHA-1: 187f23fa26983a485e33a07009934d11edfcf943 SHA-256: c32ce32112f7d2f1d426f6b3f52cc2c2c8fa15397c48f95a7e47025a4bb470a9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://tovicetour.com/FileData/ckfinder/files/20210620_29FB424ECBE94A72.pdf In PDF document text
    • http://jshtextile.com/UserFiles/file///difumudidigukopijasute.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/rizurovawonamumin.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/tmi2aga58778ntgibkkccc7ila/84712470723.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/maneguwu.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16078a0404e4ba---jakosa.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607413449e518---jasewuku.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/a57b94618c83a776047a358b997440b5/xakev.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/sais2151k2730quhqn7uc1mkh7/81613905054.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/64379531927.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/f24e390aba5b82116562102445f108fe/7057282.pdfIn PDF document text
    • http://zxsolar.com/d/files/19320285527.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/dogotopovagupamamomugafof.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/6au8e26gfdl80154rldam72di1/pesonarulosudelimixit.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e0309cc24---sujoxalaxugareserefojes.pdfIn PDF document text
    • https://latework.cz/soubory/nelasadimusizunu.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/20886233298.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/d52a58c1722166e470726c5883d20543/32530787013.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/25298754862.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/57247438557.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/16803583778.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/a49fce20c24a32b947663f8a4bceb7c7/tizobuvomuvafazibop.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/31166868177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=paragraph+writing+skills+worksheetsPDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/48138030372.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_off0000db78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB78 18324 bytes
SHA-256: 176dcfe3ce115adbe8cbb7747385a0df98db4e99679b5f60cb6b118b9aff0138
font_01_sfnt_off00010b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12346 10708 bytes
SHA-256: 2d7bfcbd23b74964918042f5fb58e774ee48ded0e9d1d52781f1d26a6f0531c3

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