Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e43bcd39db5ff31…

MALICIOUS

PDF

81.3 KB Created: 2021-09-22 13:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a33d82b8da79c5e11bf08ddaded547e5 SHA-1: 96084be5bbb988d63fd8713598ca3f32dca4a916 SHA-256: 9e43bcd39db5ff31d433884d81b2c311cd86249c8bbe28432be26597fd8d9f65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be disposable. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the nature of the link farm and the trojan detection suggest it is designed to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/1db59ba125d40983f073154610403922/60525087988.pdf In PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/gejomunotasotefe.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/27892614755.pdfIn PDF document text
    • http://gyliver.ru/files/files/badafizug.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137124863d11---mojedumorotuzewebiwabari.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/82133487140.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/97574176061.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/91334980711.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/fatoka.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021091514075373499.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/529f6c9f3d54d16be44860bc3f9cfdeb/ruwojiginikixipapasar.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/tudapada.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/70346662640.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/tufepat.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/kutofaziluwogeni.pdfIn PDF document text
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/tonopuze.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/76089113126.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/32118821477.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/zaridi.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/50643977841.pdfIn PDF document text
    • http://arablift.net/userfiles/file/24822452230.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/438ab7a8e95d61ffbf1194f4cc02f458/87004098139.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/keniz.pdfIn PDF document text
    • http://voyagerav.com/v15/Upload/file/2021921146549223.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/11122368292.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/merede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=zombie+3d+mod+apkPDF 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_off0000d965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD965 18260 bytes
SHA-256: a97412facc57689744f7001e255aa9d675011485a254b00e9807e4fdbfc05c66
font_01_sfnt_off0001089f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B6 10404 bytes
SHA-256: 9b6b0dd0a375d9113a52cd7e57169df4f099c9f3c62c969b1411a1be88c4d327

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