Malicious PDF — malware analysis report

Static analysis result for SHA-256 534f7210087b089a…

MALICIOUS

PDF

90.3 KB Created: 2021-06-25 18:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 499cd16ce17cb2b85b063b68290ac2e0 SHA-1: 9cc9b38f9f87adc4bcee85488870b7579d2c869f SHA-256: 534f7210087b089aec994a73a36467989d7246abe875b8153a5132f772ef942b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a30459ba45---wasalonuranofevo.pdf In PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/652be4b891c3f671d2ea0a1beafdbc2e/55322064553.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/ttqjlm9k61jfv40ed98e5eap76/37394398760.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/38117278292.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160832d4ef1fbc---38645366154.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/5635968d1be2bf69363ec2001edb7a96/7064541862.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/59380507703.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/36504242287.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/634c83c6ac502e650cad462f154cfed3/gosibolizutu.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/95218879486.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/nojufixuziv.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/35918128428.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/55aa238542f29f51400f174f05693f94/92978663270.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3d2946fee---bemafebuxajizelobamemi.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/domopasevovakobakojem.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88d932b6e---86893501619.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/3kmhs911dhhmaeaq6q32g24cjb/60390300235.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/53a478d5eb0a750460701bc930b265da/wisasaso.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841b2d65858---voxomakesuleb.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4923e761c0---zisirozizifoxodinose.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fa86d98f1---39010460643.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/fupurin.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/186027476.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/pa598am6ap8t2d0f7lv8hvqned/15796813831.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/30585353773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ads+questions+and+answersPDF 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_off0000fd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD26 10508 bytes
SHA-256: c2ceab629db42bf887f4f633917fe70cbd786b527eeda7d83d6b4140d000af17
font_01_sfnt_off00011516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11516 17256 bytes
SHA-256: 8a66c8d8333fdcbaced3d5566f1f34d033fdf3e74b301ae4aa4d732d83c19799
font_02_sfnt_off00014267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14267 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1