Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2eea5a9c6c509a5…

MALICIOUS

PDF

86.0 KB Created: 2021-08-18 14:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ac53d83c5e0756e80abcba768a72f0cb SHA-1: 24878c60cd3d44edfa6290b437fd2cb6d07be5d5 SHA-256: a2eea5a9c6c509a57b6701316c5364e93dbce44625ba8997508669426f8bacfd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of external URIs and compromised CMS uploads further supports its role in directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://oniceh.ru/uplcv?utm_term=weathering+erosion+and+deposition+worksheet+answer+key PDF link annotation
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b3095f7c1a5---81738647627.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/72256077123.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/20664674070.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210726_872BE6AD768E15A5.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/kupudiratuvuvefudi.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/lbnq0l9hhvdhjpm5bg2us81fhu/87674710633.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c94ee84498---wigijetugulexava.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/92965546249.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160d33e8232cef---88385615671.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/83257542793.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/72577938756.pdfIn PDF document text
    • https://soltendance.com/stockages/files/fisutewuvatanuxewogopa.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/22569618633.pdfIn PDF document text
    • http://scpt.it/userfiles/files/25335765599.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a0fa2299a14c1f0eb021d20f45bcfefc/nirosidozelonux.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/1d99868b02ebd1a1887bb5e2e8bd433d/vofolo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16084348899d64---tuvegovanisemulefilim.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/fuvegufavuruz.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/51523b6106211f6a4fff792639d438f0/sixedemuresakulani.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/74e2d101b2f7f8943c1227faad443649/zuxunepo.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/53130250016.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/52515904950.pdfIn PDF document text
    • http://vodnik48.ru/content/file/lididetu.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/6a4ec1a4a5c40410560d36776631ab13/45820374393.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/3u2fc46gak9q9beh5fsde5md86/lurudokezawusuworowuxa.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_off0000ed37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED37 16288 bytes
SHA-256: 180e7db5bbdbe6e5384790c8ca58626454e94e63f1ee4e615e2d728720bb625a
font_01_sfnt_off00011749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11749 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F60 10912 bytes
SHA-256: 9f6c9531147ac8df06faa7ee5828223b668b61fe4bee89ca60b6d9e28c71e4c8