Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce839d67cffb49b5…

MALICIOUS

PDF

83.9 KB Created: 2021-07-22 00:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 15d11dc4a121d2d5abeffbc472efbca2 SHA-1: c3b9c42b97a7e0ad1fdf49a121ae2eadb2a7b168 SHA-256: ce839d67cffb49b5b5e481116ac3c6ed8651aa8a100007b9058c934a64bd9391
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress upload directories. This suggests the document is designed to lure users to malicious or compromised sites, potentially for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://banghaija.com/userfiles/file/bijob.pdf In PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/9b0614f49f2fb1c053c229e8acd9ad5b/nenikiwa.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/1f71099c22fdb628ef74e86a3f8641f7/15292505483.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/22e0dfa9fe0650a68470464cffa92025/kopitamakipe.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/sakogevadodem.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/h88on4um4qtjh445mctu0f0954/18267400405.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/pvo4r7hvur1gn6nk27jffhqip0/43709077566.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/janikiwosop.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/9ge2gsvirsg6g00nsqnq2mo7tn/zigadezapolivuwopofi.pdfIn PDF document text
    • https://personnelcle.com/userfiles/file/xopuvofilopuzomirulusus.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/xuripew.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1eb5513b6---36955058006.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf05bd694.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160759d1248b45---52128991800.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/d09c3fe4fda9a12c0055ca5b145b6a41/lozunineboz.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/f558a6f10049f89f45a3efcc14b430e6/tarefubojelosalezote.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/r7k7dvchhu63lstiemd0q6v8iv/53534705864.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/nb37d8smbt927uvc2q4ef2tdi5/73061156727.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/letimoruxetugejat.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/liduzadapolodulames.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/1ctakm7opudfocse4o5tvlkvgg/sogoli.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160766697a8381---79756411122.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/manabituzu.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/73a034f4671314f748a2ba84d6f27854/13059975667.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bfdec4398---vonegukapuruvisowazuxag.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/d2fcc4a3f580d7c3cd8be92672c3ea77/98359027075.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb01ccb0939---96687622853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=sk+duggal+civil+engineering+objective+book+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_off0000de7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7A 19060 bytes
SHA-256: 3f570d5f09ed0ba99a70e89c0f548ef6f44d345827b407e8ff51cc0ab80d5a1a
font_01_sfnt_off00010f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3C 11228 bytes
SHA-256: ff5c74efbaa3228db99be2658199ad0b4c1fbcead96d96d1bd69efec648dd8f1
font_02_sfnt_off00012945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12945 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1