Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff0767f447a819c3…

MALICIOUS

PDF

92.9 KB Created: 2021-07-02 04:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e3c1df088f5f363184bb5edc11fe1f0 SHA-1: 5391f7320d1451c4e1c9846e405823268620ff81 SHA-256: ff0767f447a819c35f9a36e8ae0c7ceea09c093eded00e8748b64f2f3fe34e61
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to host or redirect to malicious content. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the final destination and potentially track user engagement with the lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609169a08e6fb---fumemo.pdf
    • https://digireg.dk/upload/woloxutunogapomixifozowew.pdf
    • http://ekolojikweb.net/upld/userfiles/file/lixevimozonokakig.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089beb879e5a---repotoza.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/16a6dee1e2216e9b1ed8ad1703f39dbc/780427802.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988bd66c04a---ziwilawibepuwoda.pdf
    • http://heizler.hu/files/file/25900136891.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609864813d87f---72343876735.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b4a7833ef---sasuliluvomofopofudakib.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c232938a110---73792950325.pdf
    • https://nergizleryapi.com/image/files/4556144421.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ded0a4eeec---97133112642.pdf
    • http://pogservice.ru/userfiles/file/29620576827.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c684175d7c---29389083589.pdf
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dokefojopotosaxotufubosek.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/n2n1on6uap511f91imm95if9b0/25391601799.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6c072a260---tumojedoxebovudiw.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/6f2c5f3b6e2e318cc310a0309757a67f/72301012564.pdf
    • http://goodtraefarm.com/ckupload/files/45541086264.pdf
    • https://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/78682856626.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160803135cd3a7---folimoruwogumuwofasib.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/7446g487ff22nppt33pfhrtu40/nezorajoselokeri.pdf
    • http://rotarycochinharbour.org/ci/userfiles/files/59021260855.pdf
    • http://envigest.cz/upload/file/liboz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=tomb+raider+reloaded
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0f8.bin
42a490a4309a15bce3cf4d1b69b00a1ac42765b92b45b0a061c242372a7df7a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F8 10144 bytes
font_01_sfnt_off00010786.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10786 16792 bytes
font_02_sfnt_off00011f98.bin
7a2da4b2c0763af3e5d0fc731557cfde8eb8aa7d58adae4f3ecfdbd834057729
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F98 18692 bytes
font_03_sfnt_off00014fd0.bin
45647295bf3e6975917d2c46c854a2f040b6d2f4fa9dfc4d8f9276b78401693b
pdf-font-stream PDF embedded font (sfnt) at offset 0x14FD0 16396 bytes