Malicious PDF — malware analysis report

Static analysis result for SHA-256 c72f255320ba45a9…

MALICIOUS

PDF

71.3 KB Created: 2021-09-03 08:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a288099fc663746654cc92cd6a13e154 SHA-1: 3e18bf848b8b7a7688fe96542a697f735e0a1bed SHA-256: c72f255320ba45a9f9e1987793ff94ce1e39d28bdfa0f49920399b895e8611a6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure malicious links within a large number of seemingly unrelated domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://sevenseahotel.com/uploads/images/files/50798614040.pdf In PDF document text
    • http://jdhs77.com/clients/58520/File/30329594477.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/rafm621ssae8tua7ku7olpt631/majuwajirusus.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/0fec19684d04e372fe800d7a6e134872/vasamanawaraz.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609511b6d9290---33534816696.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba74a3dca---jutebumoxufusepig.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/sewive.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/vudip.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/47399316199.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16083280eaec1c---77155343556.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/56427829576.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/beaafeb368ca4ab2830bf216c3ead440/kulodojulazize.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccc97d64f1---dudimadesutogebinole.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/sawofulijo.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608638e361bee---94370837772.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/8b2bb9debf1dcabb185ffab9ba6fc05f/12748585469.pdfIn PDF document text
    • https://ckmandarin.com/uploads/35970175870.pdfIn PDF document text
    • http://asfalon.com/__files/file/ditulokapolusal.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096c40148b1d---62909661358.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/96893270507.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/50520861351.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160881fb039ab1---18971210097.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/14217688546.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ft180a+service+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_off0000b645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB645 10796 bytes
SHA-256: 583d1a4f5f1b61f25a6d1890a1041a445d117d23d396e52974488dea03f2b0c6
font_01_sfnt_off0000cf39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74B 16128 bytes
SHA-256: 99e226d5e8d7573c244470ae661195fc574e5e35465cb87360e18364226e23a4