Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f6dbb555d6d69eb…

MALICIOUS

PDF

78.4 KB Created: 2021-06-26 16:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c78dcba23cb364faf928dbcd94acab57 SHA-1: bfd3ac9779e0a4ff96da500293f6ec8f521bba73 SHA-256: 8f6dbb555d6d69ebe2eeaaeca3288298abe1c524954ef8e4ca402cfda324976b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The presence of external URIs and link farm characteristics strongly suggests an attempt to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://ketchas.ru/uplcv?utm_term=which+of+the+following+statements+about+radioactive+isotopes+is+true PDF link annotation
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24d2cc7121---ramepelidulonunibo.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/65278163056.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2afa73e035---84907155215.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/noligejepamekemog.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/be2b401df007ef6476d491eb841abee2/jonejowugaguniwavobagijik.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/b0fb858961a461a43c0d0dafd24cb01c/dubos.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/b3f5f11c150b7d5d810e1f99e81f9767/64325434108.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/tupoxadozogomitum.pdfIn PDF document text
    • http://fygl.net/uploads/file/190253531494.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa5b2589dd---rujome.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083f7273bbef---81440899101.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-7/20210507095402729963.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/a75a3a4220dd75835a9a2710485ab613/36208698136.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c4be75be8946838fd46d24d2973fa4e9/52784327912.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3ad31a9a---siruz.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/f8a057b23e677e84eafe4fc4be5ebd71/zotusu.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/6415831054.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/70761023174.pdfIn PDF document text
    • https://schmitz.cz/res/file/zudubotevor.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b288ca9980---teluridakigolivu.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/45048967600.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/tolofoforekujo.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/ginuvobavesiraweg.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/i5osorlbkt95cbd0qpuduabi32/lajiwojusegepigival.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/levuluduzinuwufovoko.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/5db57d2b6b70835803bca45997d31b62/pavejirusiwuzix.pdfIn PDF document text
    • 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_off0000cd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD94 16648 bytes
SHA-256: 6550b75d5431a8b0672ce62bf672f0ca40cc7cf4d1722d29ba32c7b854765125
font_01_sfnt_off0000f91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91E 11452 bytes
SHA-256: f3296b334eaf8e47b3189c2282d75219c7e8e665e5a0a6f2f0d598d1d2499c98
font_02_sfnt_off0001139d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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