Malicious PDF — malware analysis report

Static analysis result for SHA-256 b46c7518f8bdc1f9…

MALICIOUS

PDF

77.0 KB Created: 2021-09-07 13:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 738a42c1d44c73b752410f1d3bd4a0f9 SHA-1: 19ce7bf2fc6d0f93b655847ba21799bbcc603688 SHA-256: b46c7518f8bdc1f992e2e264b41f891fca9aba59a2a894d6cff348b12599dc7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 WordPress upload storage, suggesting it's designed to distribute further malicious content. The embedded URLs lead to PDFs hosted on various domains, likely serving as lures for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5b6327d02---peladifakaxuwozasi.pdf In PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609825c1ba8e1---gixawozalenom.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089053d60649---82790662934.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/vizawa.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/e5cba7cb87501e6861cb494b48525e7e/33703836341.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873d674e2a0---rovibojatezonezumunuzo.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/53350117790.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/51062252254.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b50669aa1a4---votixoramufugar.pdfIn PDF document text
    • https://ka-base.no/images_students/files/misem.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/9672824072.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/48472073965.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/54821775511.pdfIn PDF document text
    • http://ippon.lv/uploads/File/kaborixizo.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/86851026547.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec0de451cc---9517505346.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/zinexizepoluburimarenave.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a7212a81192---76943342796.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/fb2f76e0d39e733ae12d8bbe3a31f1c8/86406071231.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/8c1a96ea490a0125a0abee2e8a5bb8ab/95802808692.pdfIn PDF document text
    • http://lamay.de/userfiles/file/vogelaxomel.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/wolukujawatafon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=matlab+loops+examples+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_off0000c9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F8 10596 bytes
SHA-256: 45cc2886011834d0bdc1077cc1bf1375ee96a0ee2288e69d3604f620f3fd38d3
font_02_sfnt_off0000fa0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0D 17024 bytes
SHA-256: 5306abf704c2a6cd9d86fc4ba77abb47713bd7dec13e112f8adda5f79d995a8c

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