Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4b67b5a2743841…

MALICIOUS

PDF

87.4 KB Created: 2021-06-26 17:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 95af6cc798cb64ad02159c3df43e186b SHA-1: 741518dacfcd643094b51fd91ea52e1dd91d6105 SHA-256: fd4b67b5a274384153a85670ff3cfd574e4c8b9f5d18ef04546ba4342354e26c
96 Risk Score

Malware Insights

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

This PDF file was identified as malicious by an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of numerous links on disposable hosting and compromised CMS upload directories suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 5

  • 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://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5cae90f03---43793494190.pdf In PDF document text
    • http://sportgalaktik.sk/userfiles/file/27801438446.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a4497281a2a---wolebinisewif.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/25140087965.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/ramikawedajirulufugevaz.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1c29bef6e---88725255628.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/16650157606.pdfIn PDF document text
    • https://liderpin.com/calisma2/files/uploads/sogudebodutapu.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/ddrs9jrhprl6560egfisosoc3o/17926765711.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/254bdaf900a2c342966e63131b211798/kekefumiwawug.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/k4cf3anppconger1lfm1jdael2/24672683633.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/kidovopanesoza.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/no4kb8d4ctb9llo8jqdhr4ifa6/xajomiguw.pdfIn PDF document text
    • http://mega.kz/media/upload/files/78713251804.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/46598301262.pdfIn PDF document text
    • https://liderpin.com/calisma2/files/uploads/25131351784.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16070385e2ae03---rewuzujekumovetaja.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9e54e41e0---31843343706.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/woradikunuvelo.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/nalovokekejutatewiban.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/8817b5e587ef598fc2c3ff08558925b3/gatopen.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/7109032771294a592b27a58177b9e04e/manuzuturabegumofo.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13fa2e4eee---momap.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/gokukokolid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=mp3+a+thousand+years+coverPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC10 21244 bytes
SHA-256: 719f0685b4c14d4e5cf37f3d09f2d8bdad3f6d39504f54f89e6f0c9a2050dc74
font_01_sfnt_off0000feaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAA 18776 bytes
SHA-256: 3ded9aaca2ef9e6c6e95cee9882111b9cda0db582afcb602817e0619031ab472
font_02_sfnt_off00011c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C95 10920 bytes
SHA-256: b81823f33fd08a8ae4cef97549dddf06a7886323f206322410c480bf5871c463
font_03_sfnt_off000135f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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