Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd9b89bf2c1ba0d1…

MALICIOUS

PDF

71.8 KB Created: 2021-09-03 11:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 90c073b82ea0cf55619e0d49e98fb7ed SHA-1: ab75bc7938a819c8fdd6ce4bad89214e5c55bcb9 SHA-256: bd9b89bf2c1ba0d12e8eec6aaf1f414b1842bc3a930b03d9eec11249b54a91e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. The embedded URLs suggest an attempt to lure users to these sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leicesterbiketec.com/userfiles/file/refopo.pdf In PDF document text
    • http://redskap.ru/userfiles/file/14096405614.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/78b075e491bd909f19b7d022546d34a2/74390433682.pdfIn PDF document text
    • http://dmhfamilyreunion.com/clients/4/44/44eff64e497b984d8b2945277059c9c0/File/jupusotedanifurulinokode.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/738257122608a91b46b75c453a2b8f67/suvozigesoxaluxar.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/22828834911.pdfIn PDF document text
    • https://5udua.com/contents//files/nezifiroxotasakoli.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/warubu.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160e0310fbb976---nalebegiwoxifizipidu.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160869f6fa4756---gemow.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/62223691379.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/9739a2982147a5aeada4bc1c0c391132/musoramis.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087608b10c2f---92093151444.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/95889aa2aa064b90f49635d0fe95ed02/bodiviwi.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/59691875529.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/dumesugepexifudabalatas.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/18262592909.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/masuvutujigojadulunesa.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/wekuselinid.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/9003526e79a0629fb0b1c66f387d93e3/luwukulomusuvexukawidebog.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/59722994997.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764e4640e02---1925694522.pdfIn PDF document text
    • http://cyklo-wellness-penzion-palice.cz/content/mabumipetojepapavek.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/25a88fe7acc207b23274681d16ce4eed/kefabuvizebunab.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/4d50lsdnie39df03hlcmeuf2b1/gezasuritilofozewogagimob.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/59910924383.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=economy+of+pakistan+pdf+2018PDF 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_off0000b881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB881 15396 bytes
SHA-256: 98e7708a7739af1d7767fe776b8fc4401c62963c773d8333bb860705ebbd8809
font_01_sfnt_off0000df82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF82 11196 bytes
SHA-256: 063559446b98f290563b0802a6cc5396f52b1d03586f5bcc61f029d075adf35b
font_02_sfnt_off0000f9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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