Malicious PDF — malware analysis report

Static analysis result for SHA-256 0101c2fc0102cff7…

MALICIOUS

PDF

666.4 KB Created: 2021-06-13 04:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e8b5747c28b307f84dc46d9725a37f6a SHA-1: cc0cf0088042a0dcbcc9455800010183f55c9895 SHA-256: 0101c2fc0102cff7b4dceca6eb97ec9e49480688c425b56cce3a8e17bee5e83b
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, indicating an attempt to execute malicious code upon opening. The presence of numerous external URIs, many pointing to compromised CMS uploads, suggests the document is part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8044

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.
  • 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 https://archism.ru/uplcv?utm_term=seneca+moral+letters+to+lucilius+pdf PDF link annotation
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/3rhpp8m7mmuct6nalsjp48np5j/97007436660.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ed2e42707---72151109177.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608992772a81a---gesew.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/4bf777c4ca0c69a1c4d4dde0621bd6ec/tatenagefelapifigugapas.pdfIn PDF document text
    • http://accessoriesunlimitedinc.net/catalog/file/wajokokazo.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/61824276876.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/tadogasoximonexuminepu.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608c73435acce---mabinafak.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/98cf73f584b32abac31a91d78d5d447f/tebulunonupogut.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/79908776841.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/vofekabumadepop.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/7epecq1ehufe827sddvi8n3p60/61877927475.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/59dfc1e3e83166d5686b174abd08f627/50819409928.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/fopaza.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b54aca0f161---56071462964.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/feravokexezijadikilug.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/2730511772.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000a1c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA1C51 5404 bytes
SHA-256: 4735a0415c79597e85cce136956d8dff576073b69120f379a227bf92d7574cd0
font_01_sfnt_off000a2ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA2EA1 12748 bytes
SHA-256: 2c511970716c9b2a25cf2d32c32ac43c2cf733d38bde92c011101ea5f440f07a

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