Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e34220abdc50886…

MALICIOUS

PDF

85.6 KB Created: 2021-07-17 18:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9e195192e2701ad959c521e37caf0f21 SHA-1: f7e47dd5586e8a695fa04bbfdd2853d41ece5fd2 SHA-256: 0e34220abdc50886490963b91145428e943826683f3500592593178edc15bcb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress sites, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF format often utilizes embedded JavaScript for malicious actions, and the presence of numerous external links supports a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160777b5f9321f---10699594320.pdf In PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c81ad23c0---jilimuvitukexif.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/1fad52ee2c46b00e37c6af25d76256be/libulugeveredatu.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728c6bd26e8---kufanofenewiruju.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608009251883d---35534864861.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/chr7nh1rhof53o2bfj813imjr0/65774262885.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/8e6232cb8f51b1e79a5de688643d0212/34708331469.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/ruvezisaki.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9e4e4577f---tinulevumejogetova.pdfIn PDF document text
    • http://herve-coiffure.ci/files/mowekatifuvavamutuno.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/27339516084.pdfIn PDF document text
    • http://itfind.ru/uploads/file/42868833217.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/58365167819.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/7be46d85637493a19dd39a8e75718621/lubudi.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c86960db71---24130260254.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/26943777978.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/wutofexizuwuwowuninolunaj.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/3jeq39inlbff8iiqkqkgglt1ji/32621106006.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079099b6dd5a---sobuparinepimofixoxo.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/nanajib.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4213896260.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/2007340dfb3d8c1789477d26375d5c4b/tilazogixawonipijem.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/gozikopiv.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b82ca702c---80667888030.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/67493361599.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=game+party+in+motionPDF 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_off0000ed52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED52 17016 bytes
SHA-256: 6d26423a58749a3a88fe98f1e00f58d6d5a4801b57451943990dbb3d8196e053
font_01_sfnt_off000119b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C8 10352 bytes
SHA-256: 14982983cecc24d7f161d4ff59da3f1cd482ca87897a699c290477fd8a0619fc