Malicious PDF — malware analysis report

Static analysis result for SHA-256 224c1d9e71344674…

MALICIOUS

PDF

76.0 KB Created: 2021-09-05 12:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a22caef788f76332bb865675c6110e4c SHA-1: 6c81e41e71c19f49e7ed1c8ba05b1c1d845a4788 SHA-256: 224c1d9e71344674e1f1cd7594ceb329760905960db798ab31d252b62222824b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous embedded URLs that point to compromised CMS uploads and disposable hosting sites. These links are likely intended to redirect users to phishing or malware distribution sites, aligning with the characteristics of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jowapa.pdf In PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4afc29f25---37097622756.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6e94e1795f7fd88bc8fb47bb264b581b/92025522069.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160765f303edd4---jarukevepuvogebunukis.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/jozabaremesomutobig.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/fafoposepurer.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/tawulutajovavodul.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/nijajomaretonulorax.pdfIn PDF document text
    • http://c-six.it/userfiles/files/nomutakeri.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/dutapabobefavixu.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/nuparalodedidizasimenokol.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/11753407bbbaf53a05dfe61189afb703/jakavaj.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202108/file/2108130118280034971j3zxbno4bpp.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/gofolerixalararamotenava.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/44817688738.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1071870cf5---xijovuzuvoxurasotawades.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dc363807e---norupog.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/9uqmmuosbfu2dmvhlphju984pc/89040419499.pdfIn PDF document text
    • http://abnicum.ru/files/file/fijulugoju.pdfIn PDF document text
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/zemufe.pdfIn PDF document text
    • http://leton.pl/userfiles/file/26080282229.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/sipiwujitojexir.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/32467478609.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=prepositions+and+conjunctions+exercises+with+answers+pdfPDF 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_off0000c0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C6 11092 bytes
SHA-256: e91990150603be39ca8cba68f7590d09f380d68a736753ec69dc837fb1a3768a
font_01_sfnt_off0000daa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B2 17784 bytes
SHA-256: 81fbed7835c7ac8b8f5577cc5457a09a014229555a7e8c34f853a7dc276472b8

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