Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff69871a316ead1…

MALICIOUS

PDF

86.5 KB Created: 2021-09-05 15:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 98046964e4e197958b70946400370ca0 SHA-1: 40800bdd1c6b1ff421fc9d6f2aa670a7b10f3dad SHA-256: 8ff69871a316ead1255919a8803d24730d9e867ba9819ac590b69b1e68e875cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/87d2cf52500acad53a0fdc317042c33d/44833045576.pdf In PDF document text
    • http://idroter.org/userfiles/files/komuveguzorara.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/h0sv9o5jmtbgodpbbcrh6djqq6/tolek.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///fabebozokujoromofisupofib.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b493299ad---lonusazepeg.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/24360920286.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/718778d6eebd576f8ade90dbdbbb8328/jerupelagowos.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e09fb68c00---banupofatetupil.pdfIn PDF document text
    • http://radfordhsclassof1970.com/clients/878146/File/rugudidizotuzulejel.pdfIn PDF document text
    • http://446888.top/userfiles/file/36632801857.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/utubbh3pjg2sc9l60rel70mrin/34443527489.pdfIn PDF document text
    • http://cutskytools.com/d/files/digurajafo.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/d841604f6caa700a73870a60a0d0b5e4/7606906330.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/b090921b565c7e0795e11d1d7928ef69/vekejat.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/samaxawonizujik.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/pimewijafamemuror.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708151c5aed---86558004730.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/fotevegaviditogos.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/gezulufogofujisovalag.pdfIn PDF document text
    • https://wineart.online/userfiles/file/jazawituzip.pdfIn PDF document text
    • http://gibisch.com/files/files/10004821834.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082abfd743fd---juwefujajozipaxixidogiker.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=date+sheet+ipl+2019+schedule+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

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 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001054e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054E 10956 bytes
SHA-256: d17b0e2898e9c25c788dde357d0503594f4ffe350757d2eb539f8da59f62ca0e
font_02_sfnt_off00011ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF4 17352 bytes
SHA-256: 8b012018d7def7a4cda5f1f6037baa6c7e567c14f7cb12db221af4ba14deb04b

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