Malicious PDF — malware analysis report

Static analysis result for SHA-256 47139af6eda5a4ac…

MALICIOUS

PDF

72.9 KB Created: 2021-09-01 00:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 543c20837d75af4fdb67221690aad2b5 SHA-1: 879beab73e3c309567f794c54b2b72b9093e9ec5 SHA-256: 47139af6eda5a4ace7c332fb8fb8d3bf27394271173cc82f605fba98bb43c93b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDF files hosted on various websites, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings point to a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://hocaukhudothithanhphogiaoluu.com/asset/site/files/99289483976.pdf In PDF document text
    • http://ototavandosemesi.com/resimler/file/dogeziketulisukiguf.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/tisixapazokuf.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/47816246260.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/45510585612.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8359ab091---41913774249.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fef6318a1.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/952dc804c62869d48f8ffcc1ca391c67/zipotefakitenuloragav.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160f964a597969---zurofolib.pdfIn PDF document text
    • http://domosplast.hu/files/file/23700195209.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/wemitabamadodotafomogi.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8401478845.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/62143892034.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/mukozozakupawof.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/lesejajaxuvopitinisot.pdfIn PDF document text
    • http://sansboundaries.com/clients/f/fd/fde0d4b6b324343791c5f0705b221951/File/30226991922.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/6161bfd6dba3c4155b0062a30ce3bc87/99595242166.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/bozulebutukifirugepikir.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/zivuraba.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/vusawowuxuk.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/35883815992.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/lemedan.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/5ap6sslddqe63s00m1f464ji9i/jigibufifuxofefanuto.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/h0pdpmfn6ormnkarqbd780r9s7/89063253993.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b86716c5059---33351744400.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=order+reaction+equationsPDF 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_off0000bc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC63 10588 bytes
SHA-256: 7dd4c9311df090f5d72595d6506ce23e04e2b4482474159a8239d95f29d8bcc5
font_01_sfnt_off0000d479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD479 16392 bytes
SHA-256: c1181d218f83d46a550aaaa489b366e6d1c09f55529d4f623c71adacc9779b5b
font_02_sfnt_off0000fe29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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