Malicious PDF — malware analysis report

Static analysis result for SHA-256 beeb33545ca57fbf…

MALICIOUS

PDF

77.7 KB Created: 2021-09-24 00:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 052ba987b1e9e07ac92ae796ced559af SHA-1: f74711eeebe05bb7a99326a88077a7bd970ed68e SHA-256: beeb33545ca57fbf07d7cc98704ee7f4e0cecfedfcb9e8acf96d2e7610028ff6
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of link farms hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nomylo.ru/uplcv?utm_term=infinity+emoji+samsung PDF link annotation
    • http://tcgardening.com/userfiles/file/2021090201274073499.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/8501627998.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/93091299649.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/78417734956.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/g9hgeda1peomop7r53lspii32j/fujisutopibob.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/vosovafatupokezawoxi.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/6758240797.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/mb7gco3e0no9g6qt0k1qq0jria/19868401806.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/vedenura.pdfIn PDF document text
    • http://aven.su/userfiles/file/fupavifewopinanusezejak.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/sadela.pdfIn PDF document text
    • http://bastola.org/userfiles/file/mukezevi.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/teligevelodupon.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/44840766881.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210917191429.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614ceb9f32b7c---wevojivo.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/xunejowejitesedomi.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd432dd06e---pupotogidir.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/jewereginot.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/kagidajigorigowatazoboz.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/c995740eaa9994beb2480f23a57bcef8/88065584605.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/6239989811.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2cbcf059c---75810014737.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_off0000c652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC652 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE64 19456 bytes
SHA-256: d568d7a3be41167a4979f94a7eec15e93bb5314629fa2838e797e9286f2fea3f
font_02_sfnt_off000110ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AC 10708 bytes
SHA-256: cc871eee29c6b989f2a30ae1c1c958edc1e2831a434901b93db1d77c6d59d8f3