Malicious PDF — malware analysis report

Static analysis result for SHA-256 864b874a545e6da7…

MALICIOUS

PDF

85.7 KB Created: 2021-06-28 03:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1ed0edefe63759a6158ad113b5a2d44c SHA-1: 0c7d5831282373d23f76fd1459eef00b75447bb4 SHA-256: 864b874a545e6da7a864a57f55a48531d4c08c18937020709ad7e532c5b87afb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and potentially disposable hosting, suggesting an attempt to distribute phishing content or malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/nidumumedizo.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/3fi5goq5sbfhn843b78i3egjk0/forofusogugezaj.pdf
    • https://dafelia.com/files/fowukinex.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/041fdc79a5adf5737e9956e78d1ea39d/ranirabadonawopibag.pdf
    • https://agrilaui.com/userfiles/file/76775137041.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5657b865d2---gegakido.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d392fc45cc---18216160523.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb02a99082f---56043786129.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-6-10/20210610110328893575.pdf
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/79088166203.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794bb3380d5---xuxuputefez.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c39fd39c0---61805590343.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be0f539eea7---26946140913.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160953ca23a8a0---jekofijovu.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8469480f91---resilaxazok.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d3559dc07---fesemugujezidawizunoxa.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9596d22f3e---wunufenija.pdf
    • https://mudraconsultancy.com/uploads/files/guresipo.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff4b77c3bc---25018654295.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095b7ce598ea---xexis.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/4g6k85d17msi69mu8kl8s0o0hm/13122619126.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceeb166079---dimij.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fa1b71349---rinelukozi.pdf
    • http://beytarimcilik.com/admin/editor_resim/file/21223133459.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+put+fishing+line+on+a+spool
    • 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_off0000ec93.bin
a81f7ccad33a37dd988295661067a2047c960f41b0f45bf9351ed160346539c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC93 16972 bytes
font_01_sfnt_off000118d3.bin
c5215b3458b343ef52b3d5b0748c610c7b0e3057b3d77c19b2eda1c9c2e6026d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118D3 10712 bytes
font_02_sfnt_off0001316c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1316C 16792 bytes

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