Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a07543c438e0cee…

MALICIOUS

PDF

73.9 KB Created: 2021-09-06 14:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: eb9e9c0795902188c5e7a7e374855905 SHA-1: cece75b2a1a6d0c863bc031411f40ccee772344c SHA-256: 2a07543c438e0ceec7008fa41ee335f3c75b076de0ff2bf7c2af141944803d2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/1565f15a6021c846ec8ff05fb239c378/netizoma.pdf In PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/75abb7686f8095a157bc5a99878375b9/87850544471.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/d97ad0a3ae45c61dbff57e8a0bbe45ba/dawubeporixeserabawu.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/joturenupadem.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/97603290744.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/8e78bb1bec31ca8e3ff3373de696732a/rivekabojotubobuno.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160befd1208ba1---16322837864.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfdc7df7c6---roguwepivadubik.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/fenokikij.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/milosewejowuxumajowi.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab3db3e9b5---komidanewaxukalo.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021082113002523.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/a75668cb5d7f856c8cd57d8022e6e313/60234809718.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/0314e50ea20c676d6a03ba2221f4fbc3/79316558216.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/7637471111.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abab9330ae---sujodevawikaniga.pdfIn PDF document text
    • http://jpcadonate.com/clients/4/48/4863a0bac697dd4b44f4a1b1fb44835f/File/69931118326.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608524febdfc4---71000240563.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/75786844888.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/94100657220.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca42b0bdc4---21591388170.pdfIn PDF document text
    • http://soupworld.de/upload/file/47961885894.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16113a9c75a6dd---3653644018.pdfIn PDF document text
    • http://vucert.vn/uploads/files/51574262643.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/33674772724.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=micrometro+mitutoyo+manual+precioPDF 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_off0000be1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE1C 16564 bytes
SHA-256: dcd3055567bc13a0751fc1f9a6d71d20b47a00a29a9048179d5066350a3c4efb
font_01_sfnt_off0000e938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE938 10576 bytes
SHA-256: 0055f3a3212b42a0fcae095a116f5b95a5a6facdda015d6cac62486f7019cbfb
font_02_sfnt_off00010165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10165 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1