Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a32684faa449a0…

MALICIOUS

PDF

84.2 KB Created: 2021-09-07 00:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 535235d6067feb395107532ddae6b026 SHA-1: 060dd65b42fe75867e31803c31c575c111bbeb61 SHA-256: 74a32684faa449a0dbb203a90f3f03a3c89702914fcce6a86dfdecea20bca677
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF containing embedded JavaScript and a significant number of external links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The embedded JavaScript, while not fully analyzed due to obfuscation, is a common vector for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bhs-class1957.com/clients/35434/File/83721989613.pdf In PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/u93gi8rg6gkml3gmm49gmic8vv/muwozudigebe.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/32609417655.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/dawozakuvevujokixik.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16084a2b47e1d1---6872564621.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c01bbd5ac---razeluvi.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/80998489899.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/74851319067.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/b5bf2ikibskmk35b26i33ag8ek/gelagujexolofe.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/14132104940.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210723184505.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202183819564580.pdfIn PDF document text
    • http://mqskin.com/luutru/files/besew.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/madojasegoz.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/musim.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/golenivekewekijokotovozus.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086952a7194b---15541587696.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021061207150026.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/74990785274.pdfIn PDF document text
    • https://paperland.bg/uploads/file/zezuwerasinetoxu.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/87091122223.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/fusozewebo.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/vkdbtoh6ob0rqk16d2g00tmov3/7318670822.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/18474844778.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=paticcasamuppada+practical+dependent+origination+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_off0000df4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4D 11064 bytes
SHA-256: 42f338641a98be7210ecf29d5e30a11b2bbbfc31d63b86e499972d4d5e33ecbd
font_01_sfnt_off0000f8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DC 18972 bytes
SHA-256: 54a6d5f02f036ba1d971d67c99a99808968107afd8c3f94b9a77ecc6a5e28f4b
font_02_sfnt_off00012a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1