Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff21084c77a4c77…

MALICIOUS

PDF

83.3 KB Created: 2021-09-05 04:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: aeb77245b4f0f7ac0559e4d3bd8b04c5 SHA-1: 35df97adc4ceaa7478068ab9cb42aa2071288c51 SHA-256: 5ff21084c77a4c7756ffe29caba40f56bd8428edfd665ce2b403dceb42757b7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including ClamAV detecting it as 'Pdf.Phishing.Trojan'. The file functions as a link farm, containing numerous URLs pointing to compromised websites, likely intended to lure users into phishing scams or download further malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crysiq.ru/uplcv?utm_term=kojiki+philippi+pdf PDF link annotation
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/812f5ab483cae8cc3375414887d0837a/72892888415.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b63123d997e---zevorowonanutituzefebu.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/58708732856.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/salulafijufokibo.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/rv8tkaofj05t6eqlnuvfaj1hl1/vevimonenijolig.pdfIn PDF document text
    • http://allycatering.com/userfiles/52982038395.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4664cccfda---punokeliwowij.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/7360dfb9cde529eba62d7af46e658301/nuzokivokebojoxixed.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/purime.pdfIn PDF document text
    • http://splogservice.ru/content/files/suzigivexitemu.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/puguxumedugid.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/46121460781.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17096487350.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/p95uohcks88nqn04rcnitt8ua4/68110864309.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/35770501332.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b1d633b07---94894868560.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/tonavevolabowoxoriv.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098f553cdaca---25384641034.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/55155061809.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/jiboloziwepugosikuga.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/17393769220.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/dbffdc1d494539591910d83d8e3a8b11/jazujosodoribiboja.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/579b7e3ca9ae614155a506492c35f30c/16405102884.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_off0000e33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4E 18260 bytes
SHA-256: 297089c2760d8d2596a6464ea76a52f9f48aee96c56b3949b8ce1235b68e172a
font_02_sfnt_off000129c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C0 10044 bytes
SHA-256: 41d0f043b72a26bc76828ae540841e7737cffdde25ce5f598b5027469b632c86