Malicious PDF — malware analysis report

Static analysis result for SHA-256 a544bc9024b0d3d7…

MALICIOUS

PDF

97.4 KB Created: 2021-07-27 06:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 66cdd9ffb4ca26656da13a9e625e09d1 SHA-1: 65c3fc6c06668ff8478e18a9e80ceec2f5e4f583 SHA-256: a544bc9024b0d3d737cecf8dc6e9be295f4542f5d71a2e9225ae92e0ade6880f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://fzcce.com/aimgs/uload/files/73412215693.pdf In PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a6db44fad---vozatamixokelajejupuk.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160dae6c25fbbd---jigiresiduvosap.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/pomorelaxobimor.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/kapekilomunirulow.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/889729c42806ede0af6c3d0485ddd09e/pudovofivab.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/punaretukobidujuwowujep.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/30038629805.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/c76thtao5kj1b5ejp3b763sq0n/fidisiruresanogaw.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/49251080906.pdfIn PDF document text
    • http://chromoink.com/updates/file/gironorivinarelijo.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/orce01lfi6if83b6cefchhv2v3/78100005980.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/c8464364b6140a2aa32117d8993b885a/30756180325.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/fogemogamipokatilu.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/50517607412.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/c458e03c006705ac611bea8bd4b04707/jerumujalejebekisagafonis.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fbdc693af0d---53575153754.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64b9e0182a---24394744137.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/99662387173.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1607195f4d93fe---masatarekafomod.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/d2990d74448700f2e9f93ad95f174bf1/76915600525.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/fadaf4e4ef452e1eaf1c7b15216cae0a/limixili.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/53502103573.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/pmq16htidn5l48ngt50s4l0nb1/liwataguxonetevob.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/warefolutajipipisamaga.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/3c19050e415db26209eded36f988772a/tukosugixuwadopimaj.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607759fdd6e9e---tizawukegobat.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f988fe04647---98485191451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+the+importance+of+intercultural+communication+competencePDF 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_off000118d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D6 10840 bytes
SHA-256: 77c2ae32f3b83e6b4bc1bd6074bfb79b3c8e3e0af5e1c05438f0bc31502d18b1
font_01_sfnt_off000131ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AD 17264 bytes
SHA-256: b6025cb0e2af4f6448f02ecb85054d64042d5f794cb4198f6dc7451d4a21ef22
font_02_sfnt_off00015e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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