Malicious PDF — malware analysis report

Static analysis result for SHA-256 d06e4443dcfe73f9…

MALICIOUS

PDF

80.3 KB Created: 2021-08-21 09:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cdb88edcb0d281a35d2c7b8a3e2f95fe SHA-1: 76c3c904ab2e575969e86541e32d82d532a2e7f9 SHA-256: d06e4443dcfe73f9c3adc2a755374165dcff72e84dda6baa17fd035bc26dfce6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to various domains, many of which are hosted on disposable or compromised CMS upload storage. This pattern is indicative of a link farm designed to obscure the true destination or to distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 http://diysmart.net/userfiles/file/midonoxodifidapepuripe.pdf In PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/tijotunudukuxigumake.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078cff1e31b2---31758133103.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/hvmu8viogiclfbgghpiu5j64d2/38602720090.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/25062734989.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/78139494515.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/vusuwaro.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160945f6a1d4bc---lawowujugamuw.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/1054588523.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c09cbfc4796---pubegewemi.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/48709810756.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/417830644.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a208a4c666a---varipiguxiwuvesut.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/vajasewe.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/zugimixaxusuzise.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c63e42db84---6383057225.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/34141262276.pdfIn PDF document text
    • http://hotelstrack.com/bot/ckfinder/uf/files/30938518932.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/59dc14314d9fb044fb337ada46f864b8/pomuwikevajakavedobavoton.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076a3934ffc7---98880172519.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a769d5474e1---95213232959.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803d461968c---letanozunalapipavo.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/3728366845a82fb84331e9c61b930c2d/42979210236.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce02c8c9a5d---18350571685.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/tesenojogakokutezoju.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///ketiwo.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161143f8337a80---61852858044.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=honeywell+t6+pro+z-wave+installation+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_off0000d0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E7 11032 bytes
SHA-256: d1fb0153592114b657fe5b037a8f0aa59d4fe092ab9a27144daf0ea61ab8696e
font_01_sfnt_off0000eab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CB 18172 bytes
SHA-256: fa1ce23db4f00c26394e460cee3fc8494d3b33d177837cbf72afbab80127dc24