Malicious PDF — malware analysis report

Static analysis result for SHA-256 941c5c877db892ea…

MALICIOUS

PDF

70.4 KB Created: 2021-09-05 08:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5e984793db7c6b27b7550de7eef057e0 SHA-1: e33d18a1ebcd2120d69b090a7beb3a34d4f3874f SHA-256: 941c5c877db892ea473cfcc28df29d218b1853e2bf115ed8215e0b2c69b6d0d9
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and a link farm indicates an attempt to direct users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://bagiez.com/userfiles/file/93364020805.pdf In PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/80536060857.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ed1a5921d---758242974.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083016463fd2---84037579673.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/detg5ghvf89r9o2vhnuc1f73r5/miporafewuwazowutemeze.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/limadifibitanupofin.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/vifawuvagigoxefasisiwel.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/gelajosadew.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/wafusaluxidigitonurepavis.pdfIn PDF document text
    • http://fitviewer.de/files/file/sofuwakexuromiwifi.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609875c905b54---widabafuxopejubad.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/qmnbe3k34p59ocln7rsi44398c/novuxupamum.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/c7f1e7f84068fd56fe95a4ba33fb4752/lebiv.pdfIn PDF document text
    • https://akconta.com/uploads/files/fixexujazaxibu.pdfIn PDF document text
    • https://paperland.bg/uploads/file/9846612722.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d84b6fdb3a3---gizoguvokufami.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/xadisolimivexobebesuwasus.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/sinovivuwevejo.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/94662094101.pdfIn PDF document text
    • http://kaies.cn/upfiles/210704125652255689jg4aiw.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/jubufuzisemif.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/98569075630.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/h1fllt5tko3hor1dqm3csb5moe/xipobig.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/30079957979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=equivalencia+entre+grados+y+radianes+pdfPDF 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_off0000b537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB537 11204 bytes
SHA-256: 5a3c7db8ba36a763f163824b6f99b5202006fb87d338e5b76dbda8964ae70fb4
font_01_sfnt_off0000cf10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF10 14740 bytes
SHA-256: ae7a04569328557aedea0effb9d95be3dec784a5944f3ffbbda8a2a5211cb26f
font_02_sfnt_off0000f349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF349 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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