Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d50a2229e25ed62…

MALICIOUS

PDF

70.8 KB Created: 2021-10-03 21:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 89c0c5a36eff3dc63ae5c5f5a4e6c9a7 SHA-1: 93d222ed120dc6bc53e6399ca6be4b30bfff0f70 SHA-256: 3d50a2229e25ed62051b183d3c93032dd377edd06ae02e3deef3384d4af52d8f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, while numerous, primarily serve to redirect to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://eugensa.lt/app/webroot/uploads/userfiles/files/90073349498.pdf In PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/zikirubumebiwire.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/gedobonaputezelititenid.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161309cefcd77b---ziwodidikesidi.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/nenoxanul.pdfIn PDF document text
    • http://186086.com/upload/files/minubewosu.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/filodisuxupikepe.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/ginunuwesit.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/15396114537.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/29099181861.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f16f092eef---70107671655.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/99826538135.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/90863601439.pdfIn PDF document text
    • https://vonia.mikludava.lt/images/files/29446995063.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/tilegefilewa.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/zidukenemexewe.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/93115442891.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/vepasuwojukowomebivimibud.pdfIn PDF document text
    • http://metallpress.info/files/pazepimegovuzidofo.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/36809471148.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/rifopiguluzujuredikiz.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ejrru5d6musqelr2d5urddk1p5/zufuwabu.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/5421871205.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/57803162514.pdfIn PDF document text
    • http://atsolution.org/userfiles/file/20210911001558155261229.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=slow+motion+in+kinemasterPDF 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_off0000b2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A4 16940 bytes
SHA-256: fbde6f6c95f2c72e7dc87ae278a2a11b72c507a56743507e6b6c3851738942a9
font_01_sfnt_off0000dded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDED 10520 bytes
SHA-256: 9e54b9f6abd4a00962edf3470f35cff93c028696fc80ad8b3040c8b56bce36a6
font_02_sfnt_off0000f5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1