Malicious PDF — malware analysis report

Static analysis result for SHA-256 24ab582ea5ffca04…

MALICIOUS

PDF

68.5 KB Created: 2021-09-25 14:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 287aa92678701bd713467636d61f0341 SHA-1: bbbd9fd800269f00ffe15287f4c708c22cda88d4 SHA-256: 24ab582ea5ffca044de77a9e55873e2c2006c2c92889b4bc549e7aac09c83125
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics suggests the primary goal is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://crysiq.ru/uplcv?utm_term=dvb+remote+apk PDF link annotation
    • http://bonfiremadigan.com/uploads/fckeditor/file/befesewiwedofegutav.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/kekisonozaluluxoxe.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/nizesudemadepevovusubimaj.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ugiqnp4sicuagbnbkjlfucd276/43742956193.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/sirukobefodadunimog.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/ratobifidamomuwewi.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/99301341998.pdfIn PDF document text
    • http://koutingchina.com/upload/files/90654627844.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/joxopasipexapi.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614eacc4a0073---91570498105.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/62588049980.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/19553072137.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/sokulasumidatojevadida.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/86887127913.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021092506522950.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/95642970408.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/nineripa.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161444196f2ead---megizokuzumavuzanobar.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614819567bc3c---34087940630.pdfIn PDF document text
    • https://digiconelectronics.com/media/letuvu.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/bitudo.pdfIn PDF document text
    • http://abwva.com/uploads/files/70250177668.pdfIn PDF document text
    • 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_off0000addb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADDB 10300 bytes
SHA-256: cc8654c9f654f6201470af10e0efb6c577a8362270b9386607e408508f4168a9
font_01_sfnt_off0000c4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4EC 15732 bytes
SHA-256: 4602c9edcce59f38c252999a67765470e5a5bd7f4a75833503bff697f95ecec7
font_02_sfnt_off0000ecc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1