Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31a96e3193202bb…

MALICIOUS

PDF

80.8 KB Created: 2021-09-03 17:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 285991b6fec0098c63581926b73eeb9c SHA-1: fd0e3e36df426d67d822715c9eab44d5136f649b SHA-256: d31a96e3193202bbecc05c1d01fa2547b87f6438e9e2b943e4072ede9e41cd15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting. These links are likely intended to lure users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://pistant.ru/uplcv?utm_term=order+of+operations+worksheet+with+fractions+and+decimals PDF link annotation
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/a1e0f993da9ccb997b621d5a52cd8b42/7470673689.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b45e5ea8d7---dawuxafujujesasofapewim.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/23241774539.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778b1b192e2---2755272842.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/23108734489.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/78fc06c2ab26836580b072c2262bd09b/95093847873.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/40622134639.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/vavokij.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021080412301088.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/d3e455795b0079dfc134ad566fd4b8fd/5515179558.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e666f3cc78---wusiwak.pdfIn PDF document text
    • http://slanfusa.org/clients/47225/File/bukerexiz.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/91557001419.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860f7e63c9f---77878646297.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8c822b0ae---52304233190.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/30900976771.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949d1dba1f5---17884233294.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611adda8a4c2b---84727800404.pdfIn PDF document text
    • http://falerisztika.hu/tmp/pimorawisexo.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/41536732078.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/kulamusipugixe.pdfIn PDF document text
    • http://starsunited.at/upload/files/lanajabisosutet.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a043ccc778c---vebomukewuzuxupumitafufa.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/poragusajuwixulasibofumiv.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608354b032c26---xunin.pdfIn PDF document text
    • http://chinazzjx.com/d/files/28779030815.pdfIn 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://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_off0000d434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD434 11088 bytes
SHA-256: d0c92323a47e599c43d9b32da5c6df04589887186dfe3b733307b0df8bc92b3c
font_01_sfnt_off0000ede6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE6 18344 bytes
SHA-256: c513a8c72303c4ae81aae0b7c8910db46d60ea5b574100a8e811d52fa11aa0fc
font_02_sfnt_off00011d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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