Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd15b83f52e72bb3…

MALICIOUS

PDF

85.7 KB Created: 2021-09-06 17:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6245a065e46bffccba11d8cad7d88a23 SHA-1: 80eabf317b16e940a6fc3fed32b2997d19b93001 SHA-256: fd15b83f52e72bb36f44f7b048855f9a7f89ad20b99ce4e20e37375858fa4988
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://i-daa-wl.de/userfiles/zekonemedisudowu.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31b4157286---24007579163.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4ab6ac72c---69853779091.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161333a81c18bd---pefazepidadamokirex.pdf
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/jomuri.pdf
    • https://aljuboori.com/userfiles/files/vibavumovikutaf.pdf
    • http://tieulongcopro.com/luutru/files/gidililezuzisazitomemep.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/737e934713ab21279b66ba37e87912ab/joxidegodajibugepofivanag.pdf
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/73085624229.pdf
    • https://derfo.info/resimler/files/mirezewadidabixurewego.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16098204056330---19846331837.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16075a15555e01---zolozigububugemenorekumo.pdf
    • http://yorktownhs1987.com/clients/57482/File/moxevuzogopili.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/o40rkp6800nabb2g5aat6fkko0/8078660441.pdf
    • http://allaboutdowney.com/userimages/norujesejuz.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609003e9694d5---47130078844.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=production+and+material+management+notes+for+bba+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebdf.bin
33a6b3947839e1805362d28a967e654de49bda97b898a5eab1a7dc4e5ee106d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDF 16784 bytes
font_01_sfnt_off00011700.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11700 16792 bytes
font_02_sfnt_off00012f17.bin
30eefaf69191c9f9c748adea22fcbc9063d56179208995c6f7ffd24911101a3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F17 11204 bytes

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