Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9ff8b9248090d8…

MALICIOUS

PDF

85.5 KB Created: 2021-09-01 00:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c7ed2bcfde0de72436a381b60e5c3db1 SHA-1: 2cd5830d7b2661fc0d25dccd2b1d3f4510d757ad SHA-256: 3b9ff8b9248090d8581bfb7e9d688867608d0a62c84442ed3cabfd5d1469f3e4
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure attempting to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://industrialdevices.in/uploads/16870851701.pdf In PDF document text
    • https://sindonis.com/userfiles/file/modivamamevu.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/wowaxurofifagabikidudoz.pdfIn PDF document text
    • http://cartopack.be/Images/file/giririremi.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b699cbdca---lifugivewovag.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/toxewibutep.pdfIn PDF document text
    • http://kgmda.com/upload/files/48264214161.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/fogisomaxosedolavojolexid.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a32ab3048---46868180720.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/5541056107.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/nekejinafiro.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/81391288550.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160868f7007a2b---58429909113.pdfIn PDF document text
    • http://atek-ent.com/upload/file/48316754465.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/8560727434.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/mibape.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/sawerek.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vhrcftkmr5am3pf363ngrlruj3/tiwevolajosevasotukela.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/batigeretezelagota.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/99795387807.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161219d6f3a377---woganasaboset.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/76647416574.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/5id943ee2jeq73j331ptr2uc8p/kukilokit.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/44001679264.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/68847929836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=study+guide+to+afcat+2020+pdf+free+downloadPDF 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_off0000e7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CA 11244 bytes
SHA-256: 9b2cdb36fb91dde0bba3a4e2c1d5cafbc6f86d152044465f25d1144e4095c621
font_01_sfnt_off00010237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10237 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A49 17432 bytes
SHA-256: cce724e3dd478c3c425f110d55207657fe2f4bf367c036cde69ba9bb52364b5d

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