Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b60d14e881d7674…

MALICIOUS

PDF

86.1 KB Created: 2021-09-15 20:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3e23789f1848e7e7a5b25f20b06a0fb2 SHA-1: afca2babfae2b55aa4c3adf8637d3684b424049b SHA-256: 9b60d14e881d76749f8e986257fd314585dc2412e702bb3ee9f8635a9e71a170
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites and disposable hosting. These links appear to be part of a link farm designed to lure users into downloading files, likely malware, under the guise of legitimate content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ncvpte.in/userfiles/file/xuwijadovimerot.pdf In PDF document text
    • http://ashioke.com/images/library/File/52357584607.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136a27639679---5089414170.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/viwofinapo.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/30375133622.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/68159760107.pdfIn PDF document text
    • http://duef.ru/public/file/59089531800.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/58064486086.pdfIn PDF document text
    • http://ergakiland.ru/files/files/50801067722.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141627f2d56c---38939310183.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210912115425.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f63907a32e---5158290670.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/vutijoxepozobidijagosaxo.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/161410fcec4ae6---boxawuroxamodag.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/sisezebuk.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/18705390994.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/jovijukoxeritute.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/gegolokorowigosoxaxika.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139947713242---zerojilo.pdfIn PDF document text
    • http://soc-in.com/data/media/files/bevidoxaxi.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c657fde07f---napulilivesoxoxamoko.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109121433002892.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=download+family+island+mod+apk+2020PDF 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_off0000ec53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC53 17604 bytes
SHA-256: 609ea622d29c1ee55710bda59f38fb823ee0ee6d1da84c35626bef0453bc127a
font_01_sfnt_off00011a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13277 10864 bytes
SHA-256: 311fcd03f9626bfebb3eb59e662bcd045c5be769be0c85c3aca962bff3f37ec5

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