Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed6e58774a6841d0…

MALICIOUS

PDF

80.6 KB Created: 2021-09-04 14:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 15f9356b8decf9df4949c7fd31dbd41d SHA-1: 4a020e828b753256aec6037fb2bb58d0b1ebd79a SHA-256: ed6e58774a6841d01abeb2a5dfbdaeeef367726c2ffcb422894914808c0467c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads, suggesting it's used to host or redirect to malicious content. The embedded URLs, despite some being marked benign, are part of a larger pattern of redirection to potentially compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/5706ea85b9e1b2e87af753dadeee0daa/1178390320.pdf In PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/0fd4cc685b698d29cf4b4d3080f6bc98/62355304876.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/3c0494632f31490af2bcb9087f030d02/40742313961.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/filazojirujuniluvabez.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/84780348450.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/tifiz.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee84545fe5---81428661717.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/a252bdda4ae6cfe28354954d82963ba3/dozoremibotezifuxuweb.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/78295842550.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210813_152EBBFE154B426C.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/66157936452.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b869f0968---wafibez.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/42602284855.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/pg9a5e4tf7cmh2qevfv703cqnv/sikosuribavagamasa.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/bemavevisonu.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ddd92b2d2---60541894362.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/80985674580.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9ae76aba3---77433962956.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/razutexalunejep.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/fajarosa.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/garabawenexawupezip.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/rifajusanudunedipajodo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=economic+globalization+poverty+and+inequality+pdfPDF 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_off0000d7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EC 16584 bytes
SHA-256: 7e9b1e63185e9c36997b498ace261b0100f4262c233be27154142c0040022416
font_01_sfnt_off00010290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10290 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA7 11404 bytes
SHA-256: a67eaaf5d921a60ae07fbd75ae17db34917b29d2e117d9636a143d33085745db

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