Malicious PDF — malware analysis report

Static analysis result for SHA-256 6860a07139b56088…

MALICIOUS

PDF

71.9 KB Created: 2021-09-01 06:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 936b00a83e7e8aaaf20e0f1cdc8cfe31 SHA-1: 41aa099f35fd36b96007bdcd7452e1592398f322 SHA-256: 6860a07139b560881c7a1fe79571c5dc5c6b73bd62b38494512ebfbcda32b85d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely lead to further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105a8b4262df---48397898009.pdf In PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/mopigimuwonajoji.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/7259fa0aee0c3c4e2d9447a8cda8ea31/korudakebaf.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/efb39a03aadaefd6f75223a90bb67ca3/44974494390.pdfIn PDF document text
    • https://shidoremicrosys.com/media/satufakadoxuninegibila.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/6806051769.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/92739546273.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8bf6e3f1b---76836467747.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/merenipeguguzifusebo.pdfIn PDF document text
    • http://www.trotasierra.com/plugins/ckfinder/userfiles/files/87628398603.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/46491882200.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8f52f650ae---83870605500.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/96193946060.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56d9a126b1---wunakeriguzulag.pdfIn PDF document text
    • http://tate79.com/clients/868750/File/nujolulajivorej.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcd7bc9a8f---gutegoxe.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/o38vs92e6c0dde1hlqicp1ric1/77044614639.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/21768372314.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/devojuxoxilapodupomorexer.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119b2dbd9149---vilepebabakokavonisu.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/16866962999.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160abef139bbc0---67779068309.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/wiwuw.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608920b386417---wasanelagosomiduwelafaw.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f33af38b36---93501341000.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=awesome+dinner+ideasPDF 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_off0000bbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBCB 10332 bytes
SHA-256: 77b51fb9ae767306e3eb4e619d0f157f2bea2eb8a8d88133e769434ba28c8882
font_01_sfnt_off0000d31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31D 15176 bytes
SHA-256: 0aa1a8d7a430e235a093f616ce5938b6a5d06779572dbd8ac47973304c77e627
font_02_sfnt_off0000f97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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