Malicious PDF — malware analysis report

Static analysis result for SHA-256 d21db2e9b21c15d8…

MALICIOUS

PDF

88.0 KB Created: 2021-06-28 16:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec9cb4a24484510dcaf359eba8396227 SHA-1: 46b6ed72623c2fc3b91f1d1e895e19d66b99c1b2 SHA-256: d21db2e9b21c15d8b2d4a57ad6ed9739ec877b9334bf406cc2f731dc3cb5f958
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites. The primary purpose seems to be redirecting users to potentially harmful content or facilitating further malicious activity through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/64e3d68769436185c2b52e3c61a4b8e9/30575877701.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/4dfe5a8d65bb148fd2813e90341bd60a/resetarapupej.pdf
    • http://www.dismaplant.com/ckfinder/userfiles/files/26817880354.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a8d4ae464---jigoxavudinusoju.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca941261a5---19358875901.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/6339e31b2fb3c73b93194278cb0a8478/tabibi.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b411300d6---gorupanevogasenebepe.pdf
    • https://broadcasthub.com/ci/userfiles/files/89867533148.pdf
    • http://allnatureint.com/userfiles/file/92946305931.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/cjbmedvj6v0q1gc0a204etv5v2/lumugevit.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/c96fb208ef802c24970cadd297a80fc0/51253906609.pdf
    • http://gesundimjob.at/images/content/files/wopevoduv.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/69eb905795d8e6c3b4df6589bd71a0af/nanumusovajozetopa.pdf
    • https://jjcfurnituremaker.com/userfiles/files/20722140353.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906582a227d---ragevaw.pdf
    • http://asiavent.com/UserFiles/file///vexixivurejejatuk.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872b549cef3---90994368443.pdf
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dalozanadukagurudenonara.pdf
    • https://laplacedesstores.com/upload/file/sotamu.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc013adf1c9---vikepi.pdf
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/zetesibemoletipitunubunul.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/adce829e63211c0e320564220e085bc9/34201144178.pdf
    • http://krakow4you.pl/krakow/files/busoroxinizalizovo.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0e0a0e8a7---13554987405.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/udt504l8hr9obdct5u2j9p9huk/48807716694.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=understanding+automotive+electronics+6th+edition+pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f192.bin
fd75910fc9ca9007fe02c55928e866f445adbf922965863b3ece029b25301477
pdf-font-stream PDF embedded font (sfnt) at offset 0xF192 17788 bytes
font_01_sfnt_off00011fa0.bin
6eade85a3ab74b55605b44e6674687c3b62cbb61859287f7b056223c75cd4316
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA0 11408 bytes
font_02_sfnt_off00013a2d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2D 16792 bytes