Malicious PDF — malware analysis report

Static analysis result for SHA-256 58eb957cad28e3aa…

MALICIOUS

PDF

85.3 KB Created: 2021-08-16 15:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7e561f978cc83c25b34bfd30d0b32a05 SHA-1: 39f3ab2d26bf5425208007636ba3a9cc027fa66b SHA-256: 58eb957cad28e3aac71e283bd4ab94044be8316e7b8624ead55cd95f93e8d6cf
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or redirection scheme. The ML classifier strongly indicated maliciousness, and the heuristics point to a pattern of linking to external, potentially malicious content. No scripts were extracted, but the primary attack vector appears to be directing users to external sites via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 5

  • 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://wastran.ru/uplcv?utm_term=asc+timetables+2018.3.4+crack PDF link annotation
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b21a762c32d---degazisivejogiji.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/mepekamewudorumenejabekuw.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/41074763847.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160766b3ce04f6---marabesu.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/89932974387.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/gupegaso.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/92335959998.pdfIn PDF document text
    • http://asfalon.com/__files/file/kiduvanitugasokema.pdfIn PDF document text
    • https://vieclambanhang247.com/upload/files/37551437872.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/resevobiwefe.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/76184392590.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/jn0fh74k970t5vgh8b8277s4id/88638534588.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/rodarirekemaratabe.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/ab4c1fe2b6c05448eaf282ddd50e18c9/81037621947.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/11462230233.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/goxemifebudi.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/lokodafuzugaf.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/74879060036.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebe986553b---82897434374.pdfIn PDF document text
    • http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/zomaveverelabe.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/sukujoduxigudawoxibewex.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/45a038dfeee3e80bf67258cfa9a2b58b/38030557665.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/kedisisigaze.pdfIn PDF document text
    • http://status.cz/UserFiles/File/wukezu.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/90328594528.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/0687b88fd9a0d3dcc67d55d11db0fde7/68247789868.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_off0000e5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DB 11196 bytes
SHA-256: a634c245f58b7b58fb4d980905882146916912a4b398d952b477b03af146f2df
font_01_sfnt_off00010048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10048 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001185a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185A 18564 bytes
SHA-256: 0161b375c9d0179f96ea7a7ba63f0b8e1ad7b1c596ba68a7165b6e121da338f8