Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d8ebe92ac4f2902…

MALICIOUS

PDF

87.6 KB Created: 2021-09-17 08:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 0a9e2e123f65241c5cc46795829af65a SHA-1: e0fbab641dc3f7ab142a6ebb615424f69244efc8 SHA-256: 7d8ebe92ac4f29027018ebb6ca7b801a9e7c0a2d05da07e18118f9f151244660
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous URLs, many pointing to potentially malicious content, supports the conclusion that this document is designed to lead users to harmful destinations.

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 http://studioriboldi.eu/userfiles/files/pojipubogewuwutoxijum.pdf In PDF document text
    • https://mimpishiosatu.com/contents/files/73333488241.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/98182036881.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dagujaxut.pdfIn PDF document text
    • https://panoramabyty.cz/content/dewugipejil.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/14819637784.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/81136234645.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/44203849894.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/vogigurizerakomizosujav.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/49099616082.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/75111744223.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/0de1nf61f0jlf6jvlp55kribn6nr57cf/23216057663.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/rufovovezo.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/desezizobezokagasemi.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109170419544569.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/supar.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/jolunarupawiva.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/78834153998.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406b6172315---74332557617.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf6cf9a1f9---puxuxukuziwuxosona.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/xewusuk.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/tafef.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/81943107702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=android+backup+extractorPDF 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_off0000efce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCE 18724 bytes
SHA-256: 1acd03f115099e2dd1e03acfbfa7d86b9275098a72c33e1a0ad4508e0aa84e2a
font_01_sfnt_off00011ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF8 10708 bytes
SHA-256: c8d1ff8ae42ef296f68e89942820e5db77dc8bc00a89c74d3c5458e277fa45bb
font_02_sfnt_off00013880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13880 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1