Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6326db51d751ccb…

MALICIOUS

PDF

94.3 KB Created: 2021-07-24 16:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 4c7e5c912929bc5558290af92f9095d1 SHA-1: 663028ec4be2c022ce57ae1a5d2b390a783f70a2 SHA-256: d6326db51d751ccbdc696a2132323ca3f618320c255d0a82bba7168eae1d248d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics indicate malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b07c8ee7e---jojegaxivabawujugel.pdf In PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/513fab33007ef4c3af3c6c8d8dc0aef5/14951376002.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/webemabinuzu.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/7254161914.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/jc5pcqnbne4vu7v186ruo0jd13/tatejanafadim.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/19970778753.pdfIn PDF document text
    • http://orthopediedelft.eu/files/77116981135.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/42a2949b945420439e0feb07604b4d31/ponovafinusugokux.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/xukuk.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/21823322798.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/54994554155.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/29fb47c140738754b650e7d52199e2d1/dufutubufumulir.pdfIn PDF document text
    • http://izdo.org/img/userfiles/files/bajekezobarusebelevujude.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cec297bb49e---26064633064.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/kunesig.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/544b28d07309fff7671508c24c3e2abc/kawerenidika.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/79546746104.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/19508828171.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/devituwoge.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/glf528pd1ucdt2kgih6deetps3/xemejabaxazejixogadido.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/ddbe7c71361e6a2cef84c16b28271961/zazimubenerizejefoluwidum.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/jrkj8dblcqlap59i4vri2mqr6d/kerojamebofun.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb17c0f03e---doxelo.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/xufizatamefovopuxitutaxi.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/tinipenagebaxasipeduwuso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=new+headway+pre-intermediate+fourth+edition+workbook+%2B+ichecker+with+keyPDF 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_off0000f8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D6 11216 bytes
SHA-256: cad95dab96ee9d43c194670976d495ce63aeb8622bc5d6fa99b93351dc2c0f01
font_02_sfnt_off00012ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC6 23988 bytes
SHA-256: 59eca5a36fab6931cde145f83448ca27019920c8a30b134ed7b667cf7e3459d9