Malicious PDF — malware analysis report

Static analysis result for SHA-256 dddf8c7e09bb17df…

MALICIOUS

PDF

78.7 KB Created: 2021-09-02 19:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c80aacd3ed1c3e3af7f27b28667ed19a SHA-1: 0f89925f5f5b0461d0fef3d9d9359d4aeb8a6af3 SHA-256: dddf8c7e09bb17df9656be8593a4df89fa8e7e14448e42ef40cf594250d12f78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to numerous domains, many of which are hosted on compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The presence of external URIs and link farms indicates an effort to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f315027a70---50992889935.pdf In PDF document text
    • https://tradingphrases.net/userfiles/files/68343458859.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/kofuzufik.pdfIn PDF document text
    • http://m4krichmond.org/clients/3/3b/3bf4c986be49c21931b3574e72fd8103/File/23198096259.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/vukakeb.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/putagizejufatapom.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/lobubiwutesutujilezuso.pdfIn PDF document text
    • http://serenetransformation.com/clients/870552/File/sosorumelopurin.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbc7cf135d---zazurijapedi.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021715234844618.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ba4e697d2---63644390172.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/baf6f8afc08deb78905f2123252bd640/24718599207.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/5949000433.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/de7f6f146f44f0298718a95a6a9a7cab/91573500807.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/kegavafumod.pdfIn PDF document text
    • http://schmetterlingsgaerten.de/file/kamonalo.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16123b015c4698---28970770718.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb95036928---78941192236.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099a79387ac7---66536744761.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/1hai6p48om9h3j1tl9e00acd02/kuwuvopaxesikaxowuza.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03248f15de---42049219795.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210719043121.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2da8e44f0---nadoxuwopevafutozoper.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/26153726856.pdfIn PDF document text
    • http://chinalabware.net/d/files/28524282721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=skyline+chili+menu+prices+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_off0000ce95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AC 10888 bytes
SHA-256: 49b4629e34b64227fbbf3461e79038f1fe80099c0b6af0e2a19206bfcfda43e9
font_02_sfnt_off0000ff8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8B 17596 bytes
SHA-256: ab50fe4752044b0a76ff30220d3aac03fbe3a17e38ccd57243dcebc0fcd093c0

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