Malicious PDF — malware analysis report

Static analysis result for SHA-256 0543569de2eec03a…

MALICIOUS

PDF

84.7 KB Created: 2021-09-01 05:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 882edf89ba9b4c657f901d64a53c23d4 SHA-1: 8faec5321e4a91de55d029df7bf52bd7ddc970b8 SHA-256: 0543569de2eec03a290c325ab19746aa7842e7bc9488b370aeef8f18446fed8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://synerhu.ru/uplcv?utm_term=use+print+options+to+save+as+a+pdf PDF link annotation
    • http://teckim.it/themes/userfiles//files/parunerewunuzogixipebi.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16096e56088b4c---55107780381.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/35577139376.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/1327756858.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/33608937928.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c081b7e1587---44034793324.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091e30f730c1---70405039441.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/9f687ffcdef5e5362c8e399ff7ca1c09/71238800575.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/libuzaboxajumixanube.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/3fe2ac7efbc772216b2eedc80e7e9bb7/xujabevinonasitagemupuw.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/83361481296.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084645245724---vevuzip.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/21/file/20210521_133433_103.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/1380581638.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/xijefamugateragep.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2629fd8913---79707979888.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/kejusugovuwaxunumu.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1610bd31e2cf11---40543064977.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160d09760b6261---fejufo.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/mizizofapodumavusalibaxa.pdfIn PDF document text
    • https://avenue102.com/uploads/file/wexabajevawuxinosukemebo.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/wukulokabija.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_off0000e7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F5 17332 bytes
SHA-256: 645dd9d7bc6373241f0a0e44bd6c8a531ed45a3e320e7d1d21a2b85a72e7aaf8
font_01_sfnt_off000114f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F4 10516 bytes
SHA-256: a16eb6dcbedf823670a4eb33ed17ee9c7f1efd7309220f9751d40f474e3ef03b
font_02_sfnt_off00012d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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