Malicious PDF — malware analysis report

Static analysis result for SHA-256 e39fe2f92017ad81…

MALICIOUS

PDF

84.9 KB Created: 2021-08-24 12:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5fd10a5d8e374f34f09c230e1b560402 SHA-1: 099cf462942dddb1ec4851d62c77976c58d1c2cc SHA-256: e39fe2f92017ad81aeb3dac3e9b2416652cdccea4c70c9dc153d94f598dd494e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm structure, with numerous URLs pointing to PDF files hosted on various domains, some of which are identified as compromised CMS uploads. This suggests the document's primary purpose is to redirect users to these external links, likely to download further malicious content. No scripts were extracted, but the overall structure and detection results point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bodegoncriollo.com/userfiles/file/zidilafag.pdf In PDF document text
    • https://sfeerweter.nl/userfiles/files/demegux.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/161eef64f4dbdc593720fe84775e8b2c/64560496525.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf62a27973---nisutag.pdfIn PDF document text
    • https://soechi.net/userfiles/file/modisijux.pdfIn PDF document text
    • https://ikima.fr/uploads/file/54730472588.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/5f535687c2f23c09e1ab239ccdfdeed6/zajixosubos.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/roluxatidabekadedibaru.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/c51cd52ae82910da92cc1064c9cd0154/galex.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/57464515194.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b526a81a7---lemamam.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/adf0daa19c02794b534d9996729c83a3/21682322391.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/dusewaririgani.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/tadokelazaxufuduzuto.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/91efc08d6ad561aace1521d21d769c95/28328724456.pdfIn PDF document text
    • http://kaies.net/upfiles/21070810091493825882fsca.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/xojasofeborufolog.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16090962c14d34---75274062755.pdfIn PDF document text
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/zajugeja.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec794a09b3---lusaparotikaj.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9da77efce4---85561702981.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/4714888904.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=public+speaking+for+success+by+dale+carnegie+pdfPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/bowezukekojodogatu.pdfIn PDF document text
    • 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_off0000e494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE494 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAB 11144 bytes
SHA-256: 48516c540ba0056c2ddea6f9c24ccf898939390ce79c52b0da9af47f6cb5235f
font_02_sfnt_off0001166b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166B 17824 bytes
SHA-256: 7ff4651563f7b5c97e32c7a454350662ed2ced86650857f61d49fdc4925d43c7

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