Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99ebcffe80ebf6b…

MALICIOUS

PDF

79.8 KB Created: 2021-09-02 05:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 79ddd2c3f661be358e8fc27c4f3b47c8 SHA-1: 8995e465e755862482f405bc43d8970ad517e67a SHA-256: d99ebcffe80ebf6b9fa03b27be52c277ca6cfb3e0d9473fb2e0cc75d9c43f2cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, but the structure and URL analysis are sufficient for a high-confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://blindnow.com/userfiles/file/42466276881.pdf In PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/2ddbaad3ff5ef688de3726a92152ae3a/guvuwapiferivefig.pdfIn PDF document text
    • https://goodline.by/userfiles/file/gerubadelovoziwalumuwo.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/muwedigenitudoxale.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/781499d160b91d2a178be4908e8d068e/vupisepalubunapasaj.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160791312b6c14---40665411281.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612a3c04ccf1a---pibetufaj.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/baxukamopojopupomiludesa.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///51502863088.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/80612592543.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/tufivuwuki.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/59595838351.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c20f34aac99---remejabazemefimajikero.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1c842d2691---57207193948.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/18cc43a9df5c6a1a545dab151d2c452a/92528165934.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/58897956068.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/202156223414016.pdfIn PDF document text
    • http://usmleworkout.com/files/file/62961361095.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/24203550406.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/47627499276.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/dovepudofipir.pdfIn PDF document text
    • http://landpas.pl/upload/file/12218483740.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160707cfb3d86d---xifelejopejigadir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=find+a+judge+to+marry+youPDF 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_off0000d260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD260 10700 bytes
SHA-256: 476426b5f73741d8897e694cb8307c12c9567fb2ac5ef8428b8c21b0fcdc3583
font_01_sfnt_off0000eaa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B8 17832 bytes
SHA-256: ac1f4c332c9e11539f6537d14dee63adb20abb2b0425d789321c2e6fd1d10535

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