Malicious PDF — malware analysis report

Static analysis result for SHA-256 a95791ed0f2d8e81…

MALICIOUS

PDF

80.4 KB Created: 2021-09-06 08:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2287a031fd9a55e0162286667cb9aaa7 SHA-1: 97b27e7ad4240bbf57c019bd3c50c3ce18cdcc9f SHA-256: a95791ed0f2d8e81fc41ca8c7f274e9a50f3cb72d7f635b07e16369e5dd96678
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://myphi.biz/nbloom/fckuploads/file/zobolapenososoxez.pdf In PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7983fdcf63---webokubox.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/49hfb9qku092csu4hq4jr7p2ft/gekamafebelefaromofozoge.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e062fc6080---fupebotu.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/bufuxasajojuloz.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210705_2B9116ADD8A12E55.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/f27e52f678cab55a8080639a8507aaac/vuxokodakazomakexixamoni.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/qe52k4vpj609vqga0cir90tp6h/60072456065.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b06cd121dc7---reketawubo.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107defc4c54e---97529165461.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/43565082042.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad260843c54---pulevefozuposidataj.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/43756673013.pdfIn PDF document text
    • http://nhaphangmy.us/upload/files/bofupopavepix.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/c6aod671hcecc9u693isvp55ou/81558349545.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/23743380078.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/os0thdjgdr1d8jg05o47mlr6h8/kotibuxum.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/rimutopabezesisigusagob.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/85151918740.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/wularu.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/161035be9185d9---vafake.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=jeep+grand+cherokee+laredo+1999+manualPDF 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_off0000d4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AA 17588 bytes
SHA-256: ca2c66412ce671c1d5fbb115b5856955c6752c256dcfceefee9124421f8c1f50
font_01_sfnt_off000102c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADF 11004 bytes
SHA-256: 09e2bdf22450a2ef05530d358de75eb3fd288e53d4694a436b8c57f1ddf3bf20

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