Malicious PDF — malware analysis report

Static analysis result for SHA-256 25cf04a75c76e53f…

MALICIOUS

PDF

86.9 KB Created: 2021-09-05 19:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0ed417c440d05bfbe35cc8ec8cadb27a SHA-1: d9dcd3c5c79e4c97f07a4f2292d70d291035bbec SHA-256: 25cf04a75c76e53f1110da945c611d40ea1db9933bffbe5f0b003ea1bb16ce6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic firings point to a deceptive link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/a581ee1d99193954ec71ac5b9bec8227/zuzebowe.pdf In PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/789d94bb1088007a1e512771a6200ef5/fobuja.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/kuxirofiwe.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/lusujogogulowu.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/jopuguken.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd1985bf19---sowatomulujabukolediki.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16093e71b785b8---45649797278.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160755ae53d44a---3487118235.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5f44c3010---zaverav.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/67195625709.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/49284109834.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e4dcccc3e---8937173095.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/jc6l3mm8cltspn2nllv87tklt3/lesapomesatifimoxaduwijeb.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/9ap4cigibcf0qfftp61rlajmu2/xizixeluzinesuvisaku.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/38901200932.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3772ea71c---kerumosatureni.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/vewijekewijugiwevugezo.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b66859ba176---12869212734.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/karelotome.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/jefelije.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/h0prbu7anf7d1vdkgm6c4kaeg4/gikotibefemekukoje.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/10254858774.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/357474624.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/selisipaba.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/fidewuragiso.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/da45d8900ad5eecf4d63eafbfcfd8d7a/wiwikumababibumomedubu.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/94d031836de20f4f136aafb7e36f93ef/94907687395.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=control+of+communicable+disease+manual+20th+edition+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_off0000e60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60E 20204 bytes
SHA-256: 3564e83a5285e40ca93e4d1dd13ae5d29f3f01deb2e347aba251768dbb894004
font_01_sfnt_off00011a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13246 11400 bytes
SHA-256: b84c6bd58b304959fe7b28b07f5fcbde1ba300bc846757717d3a1534684df6f5