Malicious PDF — malware analysis report

Static analysis result for SHA-256 e684419fb8308465…

MALICIOUS

PDF

80.8 KB Created: 2021-09-19 09:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8b9e3930f2fe53870a48decdb82df550 SHA-1: 8f8af44c0095af99da72ef57defa210d05319777 SHA-256: e684419fb8308465181b348302fe1ab7cfd105004867c2a850334d1384993745
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://balmbeach.hometeamcorp.com/images/usr/8444032793.pdf In PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/18730972415.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/55025533117.pdfIn PDF document text
    • http://centronegozi.com/public/71781262980.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/dutifonafidemapigexu.pdfIn PDF document text
    • http://rhondachem.com/d/files/94947075869.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79507784928.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142945ea78a3---wigopafudigosugoretud.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/7bcccbac8195639c5df778ed90c9b2a3/pokizamimaxajel.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/22608216933.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/senituta.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/xodoxuj.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/9984001668.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c4a36cac3---zejepaw.pdfIn PDF document text
    • https://emenu.hu/editor_up/jisutefipupinuvito.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/98385668472.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/gcurq9vrjfe3eiflbikhfnndf3/nupokodupebebuzamurigasa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614094c1f0ed7---14520131899.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/64068894987.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/975396685943a4a18c8205bc9cf4a5fe/rinojapowez.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/032e08c362dd27247690a3acd350976f/59312117821.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/19337805882.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/55880275942.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/74dfb9bbf6bab22db081483ee9fa6c9f/duvofubazawozilezowozosuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=super+cat+tales+2+mod+apkPDF 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_off0000d36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7E 18392 bytes
SHA-256: c453baaa9ffd8c5a7e806dabfd08cfaaf915257766c53139dfca7df03c267270
font_02_sfnt_off00011c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C17 10864 bytes
SHA-256: 0a9cae809a3d62bbf76b0ab29c9e2ab0aba4609d3ba350608848fe38d2e4e52a