Malicious PDF — malware analysis report

Static analysis result for SHA-256 1405e0550e419bf8…

MALICIOUS

PDF

73.7 KB Created: 2021-09-04 15:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 73ea6a94dec24c073bcd9a5515dedc8f SHA-1: 1a5b16e735ca7755dbcc2482efc4f848f9a385a6 SHA-256: 1405e0550e419bf8b345ef37f4b64207f4f38c2c3112e6a93712a2889c42a096
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs, while some are marked benign, contribute to the overall pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://asiquim.com/ckfinder/userfiles/files/luzuxa.pdf In PDF document text
    • https://dm288.rs/slicice/file/19139304643.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/39823232736.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/92f862a791b0540958e3436be43cbd8b/banifitomitizuzusanuzufew.pdfIn PDF document text
    • http://dsfly.com/uploads/files/77895705251.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/5c17d591810f7d1f9b216f83365c9d44/6364083445.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/88679727877.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/1ef7116df56f09a08bfb0ae01926010e/desevozamefot.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/19131144049.pdfIn PDF document text
    • https://wagaskar.com/media/25520198975.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766a9d1e9ae---50189332978.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/54511474527.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160817a5146634---botugegivifowokuj.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/16401183060.pdfIn PDF document text
    • http://araonline.hu/uploads/file/53666938848.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/5af1328679812ac1b042d3fa2fdae9fc/32160617145.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/43175607257.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/87739890954.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6ausao7mn6m16tg9fggcccspq4/guzetukoke.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce9452690a---kozepufoxuvojapatejofe.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/62525935048.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/89747547755.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609edb7ec388f---48854367329.pdfIn PDF document text
    • https://noddy.nu/images/file/98589205335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=ifrs+4+english+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_off0000bf63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF63 10424 bytes
SHA-256: 3ad1bee779e7f6a43d9268cdde4d7d4412dfbfb1e95f81d9235e3b01f85db100
font_01_sfnt_off0000d6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBB 16420 bytes
SHA-256: 6bae928a3565633f014ae4a470d3c4d778e4b9b93f8cd1b21c4ef5cc0687d62d

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