Malicious PDF — malware analysis report

Static analysis result for SHA-256 61dba6a2e57f8a00…

MALICIOUS

PDF

85.9 KB Created: 2021-09-01 07:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cea9af027c72621e29c951f82ea04760 SHA-1: 4fa20df0224594e040f5ecd2ee6aa759510245d7 SHA-256: 61dba6a2e57f8a0037e25d3ccc82c471ef0563eecee29c5001ac628ce4c09f94
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are flagged as compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is heavily obfuscated and appears to be generated content rather than user-readable text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ergo-logo-bamberg.de/userfiles/file/96026053037.pdf In PDF document text
    • http://salinahighschool1967.com/clients/c/c9/c9c88be04994199279bceb128c91314f/File/38966576428.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/xamibuwedazon.pdfIn PDF document text
    • http://goref.ru/files/file/fikemekag.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/32770149778.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/47093029207.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/zegexugabeva.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/96017538083.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/58648686329.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a178b76b0f9---21897802629.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/32948127836.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/54463549951.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d686df1103---304439641.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/keridija.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/28377937494.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5976854072---pikenubesoko.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/fakuke.pdfIn PDF document text
    • http://anpo.vn/upload/files/98003251709.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610fefe76a19d---33845840914.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/zoxoxinozatoran.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/mabaworizuwigixemo.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/j0di7cbennpgt1ma6n7ih29fn7/3418952659.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f1026d9ca---jogamiruripip.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e29f101e58---ziroreme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=list+of+spices+and+their+uses+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_off0000e91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91C 10728 bytes
SHA-256: 4dd9a5fedd600fcc14114dc6d2b85b06ef820bf813b9582ef0f3b098e2a84191
font_01_sfnt_off000101b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B5 18588 bytes
SHA-256: b72e3f3579897007ef57f64f7a0ebe9d588880f178fd90b131c7c54489a9cf61
font_02_sfnt_off000131a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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