Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a924933a5ccbe7…

MALICIOUS

PDF

121.9 KB Created: 2021-08-11 22:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 076a0cbdad15d541280038c5ffab8f29 SHA-1: 50756afcdcf716c3b52a2ba99667e182fb2ef5cd SHA-256: 12a924933a5ccbe72b51cf8324d0666ce6ba3ec0ec34b8df8e43be009be3de23
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure point towards exploitation of embedded vulnerabilities or user interaction to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2786e20ed---dojoleremuxa.pdf In PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/c12e3e89351cacb5abce63f6237a7d7a/89531224465.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/pemenodugelotitifivalaz.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/0dcfd446ec3cc783a6e62023e439aadb/61717351060.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/20vvitj8b685sj6gk4m9g1juqt/43858281715.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16075ea82d6286---5698083651.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608416eddcd3d---60249900514.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/batukemuv.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents//files/65422971536.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/14338283225.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/o0noboprren1n4m0v45sap4bl6/vawalubilidudegexu.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/94186335682.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/bfb0c1568977df32ee24f1c2239669d7/70901271346.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/jefati.pdfIn PDF document text
    • http://healthywithhart.com/res/file/38515472275.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43014444467.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160733b889a634---zuruwawiruzi.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160be641a95286---magulezipoxafenelu.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ecea50360---fejab.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160929a705ea05---49502030568.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/c120c50e8e619fc84ea773f35df494f8/63770619554.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/95061039824.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/luluruzivu.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210802014851565586resvc.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f89e85d9a---9950501150.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=what+is+supreme+mathematics+meanPDF 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_off00017911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17911 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19123 18064 bytes
SHA-256: 1fdbc8025f056b5f306b6c54b27038a67d3275d0751b9c90b49990370abc7200
font_02_sfnt_off0001c0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C0AB 10564 bytes
SHA-256: e096a4bd4dc0c0f05b5e76b93c40af33cd38b56f2f95e7ae7923d5c43e9b5b68