Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c76b8929f0b4a5…

MALICIOUS

PDF

86.5 KB Created: 2021-09-07 12:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f9906684a0df209284a1fca351d76825 SHA-1: b3a401a1b05d5d3a50eb587c2b0180d263f652f2 SHA-256: 19c76b8929f0b4a5866dfd1b2566cd6874d524c0a7543856fc0cd129559f9484
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan, supporting the assessment of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xurazukafofarudam.pdf In PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7c6568a86d---57866243793.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/fojifekaduviw.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/nivemevawulidixoko.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0885581267---32118761985.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d0a053f9b---peregoxosuwobip.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/3b601cbc462e23a4265931f3bf6a2047/dumagosunugufer.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cada5fcd070---kubozo.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/pideduxasijipufijiru.pdfIn PDF document text
    • http://bellsazshihtzu.com/clients/878694/File/rigosoguzosuluvitojisop.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/76959630216.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/28dada3e1f9bf2496ef2d2f62d2798d5/kokezufetopanesegobe.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d2f771009---moxapuneropedofo.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdf5c1ff83---59342952480.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/34870585839.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/bdmud38ikrbi484jahfsiue8vm/41843069048.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/095468eb80d729265029ddddb84e257a/miketan.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/56e2ae7ca35eba1ebc4d7ce236e7c0bc/50118334262.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/22pqgqrjg9lrqnvhl9q5bbmbgs/63359213856.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9a70df9c9---72636119998.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd14e36b39---dukilukume.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/7282217024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=glaucoma+congenito+primario+pdfPDF 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_off0000ebd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD9 18028 bytes
SHA-256: 6c8650b3c9ff8c6511de5aaec41e5186e6da9a3f0df063a41144882877f37367
font_01_sfnt_off00011af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF8 10936 bytes
SHA-256: 20fd00a4179e875f7f7dded1db8c76b2198abcb086ce22a7492d5cc5b7bc8a86
font_02_sfnt_off00013415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13415 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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