Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f28c8c0d39b0b1…

MALICIOUS

PDF

79.5 KB Created: 2021-08-28 23:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a5463055a10c99a36afdce6c93307a1f SHA-1: 8a97a44498521e629210fdfa7e44fe047107797f SHA-256: f7f28c8c0d39b0b172198ae0844b265ae14e7bebc099c4b0cbb32209e4bd5631
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d4d2bebcbd---literigebipeposarozexap.pdf In PDF document text
    • https://leganordavigliana.it/uploads/file/fenajubatepaxa.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/72925980291.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/319514039.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/funawilokowikuro.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608bef57ec987---63983522803.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/kuvesina.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/61475985752.pdfIn PDF document text
    • http://palami.by/images/file/82475333890.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/58841193055.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/73668927810.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/a80a9ptr8grirmfdpeia3ba9f3/82201579474.pdfIn PDF document text
    • https://ibextrail.com/editor-images/27110604738.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/burixonuli.pdfIn PDF document text
    • https://www.natursany.com//ckfinder/userfiles/files/1008002039.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/45002803177.pdfIn PDF document text
    • http://weclassof86.com/clients/6/6d/6dc59c75684a9be5e3a4726337e2fa3a/File/gadusedegadofilenutuj.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/s18qbtjdcp6445lm88gjf7muk1/samugudivoxubeporama.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/77986071203.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/3c85f5a3318a53b1520dc9e99fbac649/15214799112.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/3rcevbrc29qhma2n23dkou601l/rodovodilera.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16080fab9ba2ff---92101611461.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/podotetilaludi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=lirik+i+can+you+hold+me+in+the+streetPDF 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_off0000ce25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63C 10896 bytes
SHA-256: 6a659a1f40449941e72dde40f20dee6dfee2db15e8cd1c424f53e9d59d9634f8
font_02_sfnt_off0000ff4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4B 18196 bytes
SHA-256: a120da1c1f6d66bf01d7437c9f547b4eddb4222c7ae7ae1b0630384eda53e19d