Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffa60e6dd84fe0b8…

MALICIOUS

PDF

81.5 KB Created: 2021-09-07 20:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 51acaafd82f615e910e2b843ccbe2855 SHA-1: 800421ae6c287072627716e51604f82e893a28bf SHA-256: ffa60e6dd84fe0b89f34aca34076044733acf3e08b9f3471abe8f59625d6aa07
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of numerous external URIs and the link farm structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://salvatoredivilio.it/userfiles/file/putiwemajok.pdf In PDF document text
    • http://www.awakohchang.com/image/upload/File/unazudoveduxivedomo.pdfIn PDF document text
    • https://hirurgija.me//files/56215290448.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160c3734d7ab42---fapimodabatijisimines.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/levetonefilofinewe.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093e98af0d32---lobabibezakufibaxuxob.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/pevut.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/lupixigosovidojuwunog.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072fb787cb6c---denifavosabaradigaxagi.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/fedafumafebomobaxamij.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/zukiwe.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/m44oi72u7k7au1a4sn3ef38r93/88967274398.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102d34d84aa0---23298537133.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents//files/49295926821.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fdd3204de---90181773424.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/61526461896.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8b2f632b9a---dodikidemusumawumululel.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/6f1ef5965d54e03f5f29212c717ee033/xumaraburaxitutuv.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/3886022976.pdfIn PDF document text
    • http://susutour.com/userfile/file/midekagusukifuzunile.pdfIn PDF document text
    • http://builderall.info/userfiles/file/sefupixulobelodipug.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/73507833582.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=mandolina+kapetana+korelija+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_off0000d57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57A 19476 bytes
SHA-256: 38eff17438ffa4df57daab04ea0bfdac274efd06cc580f042d5c90666c491469
font_01_sfnt_off00010833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10833 10540 bytes
SHA-256: dfd310852ba73fd9dbe56c21f5d6b17c25cb1d57350d716a07eb3465e7456eba
font_02_sfnt_off0001203a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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