Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b8ec6905e2591ad…

MALICIOUS

PDF

85.3 KB Created: 2021-07-19 08:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1df4225ebcef2e26bcee147bedceebcd SHA-1: ea0bceb5c51479e7c8e62f1206798be0b309ea48 SHA-256: 5b8ec6905e2591ad8afa4a04fcbf6e003bf0d828956fa1348af894d6138e3971
164 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous links pointing to compromised WordPress sites. These links are structured as a link farm, a common technique for SEO manipulation or redirecting users to malicious content. The presence of external URI findings and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4940e1924---suwiwexosunagexomaluwif.pdf In PDF document text
    • http://akwarella.pl/user_uploads/file/96548763118.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9f0f4be64---rebujexuri.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9263e30c89---37569470825.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/ce7d5e47f51b5cb873a770bc92e266a8/91492272431.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/a2ibmee2ohvebf7f1i8r0o12n3/wilal.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/00e8914ce2470c9e8cf75f2d48ba41da/74691217256.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/5648e599a52238976106a0c6cc543cad/33666999319.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/rezodejupegivifu.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098425bdde81---popogigurejiretujuposuso.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090c8d62712f---17642666979.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609acba25d985---lalawobelofufu.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/dakorev.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/2633ef023c6939dda49d2562c72ba595/mugujopaduluxiw.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f27d6bd2---kajilixeripalobizarotosiz.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/65314153531.pdfIn PDF document text
    • http://olneyjune65.com/clients/d/dc/dcef5d22f85ec69f5810ba62c2e8cf46/File/xukije.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/91143221943.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/74453087003.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/42773093356.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/82426287086.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/vi47shvk0mochv0dmagnq6kvlp/negibuwew.pdfIn PDF document text
    • http://cuatudongsaigon.net/uploads/files/75121408779.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/gekarokemitisirobominot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=application+of+derivatives+in+commerce+and+economicsPDF 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_off0000e9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C3 10828 bytes
SHA-256: 3984c9016050c4ebded626ed6546a09aec6ceaa8dd626b2d2c7b3103a459e582
font_01_sfnt_off000102d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE7 17056 bytes
SHA-256: 2ef9e03b22c68c43461c1d6e86a8415b52720fc99bf3dccb30a52ce00b0c5c1f

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