Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c41353aed4f2db…

MALICIOUS

PDF

84.1 KB Created: 2021-08-11 10:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ab0b3604bdb0749641189cd42b1fa61f SHA-1: 3e858da4bdda0b8e1ab575c45ffb578fedf2e607 SHA-256: 80c41353aed4f2dbfa704737a1c6716405c1794827a606e28cf74261eeea2c61
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure and link farm heuristics further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/60a5319f18e7012f2b9f138e8dc11611/fawodovazewuvedisokon.pdf In PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/42bcad5d211648535fa2a714abfb730e/73704726825.pdfIn PDF document text
    • http://synowka.pl/galeria/file/mumosixekibiku.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d2ff08d65a---90932605822.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/mosazosasovomale.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/76136eb183f6bd80a5895d0e65da317d/28153458020.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/35317918845.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/909fa353bd96917ac287625561e40bb2/bugoroseresefunuxu.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/31669838742.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/tg9c24cvupmdkadvitjnde0si5/38659538632.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/6e80abf811efe5557a3d3ed8907b6a09/vemaniduwoninopobanes.pdfIn PDF document text
    • http://sdds.be/userfiles/file/43484744149.pdfIn PDF document text
    • https://designclarf.it/file/magumokogegelake.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/0e99ce5ad741924ae9c93f7aca48e562/peditujixa.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/76155669766.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/70559566134.pdfIn PDF document text
    • http://sushi-belovo.ru/files/71837243948.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce601053d2---76858564300.pdfIn PDF document text
    • https://vpntraffic.com/upload/files/87797385668.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/dawos.pdfIn PDF document text
    • http://fpole.ru/sadm_files/mijogatibuwolomixepagug.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160882961e6278---kakesasumen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ms+dos+internal+commands+with+syntax+and+examplesPDF 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_off0000e128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE128 17800 bytes
SHA-256: 78bf103f5621d317a3a3379d63542ae338291cb3719b598ee4e47b61c49465af
font_01_sfnt_off00010fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FA 11076 bytes
SHA-256: cc3c93894d26d07bec3d6f08b06a710011a699270fb9b67d3606e3ef1b34e1c1

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