Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f9a85fea7e3fb70…

MALICIOUS

PDF

87.2 KB Created: 2021-07-03 22:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ea484a633a767e4aa22cc2260ce03392 SHA-1: d0a4353f8cbab9bff816fa8e95086fcca3d28398 SHA-256: 8f9a85fea7e3fb701c6c2033a0a2e55176f589a45e00e7ac774d78184202088e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised websites, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) suggests it may download and execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/ht39132ukllb3vihat2to4bi7o/25380124749.pdf In PDF document text
    • http://baaningdoi.com/file_media/file_image/file/jutuzepapow.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7732c3998e---rivapesewuxetuligovitofa.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/40108950465.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160799f4758c8d---beletupiwevedatamesefosi.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160928e1f3ecfe---jabav.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/56595891525.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/tm4eubm9j96vmirf24sc9nk974/94999632563.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768dda90c0b---miwagivi.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/c392e531eaf7163de459f24accf1926c/pazojamunopetujo.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/85610503335.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875e45d1e3a---12632626370.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c0b99d06a---vizuporixovumefakozemid.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/03f601bc19121fc188a0301462944a3d/44856936094.pdfIn PDF document text
    • https://wavemed.it/wp-content/plugins/super-forms/uploads/php/files/57de089fbd467b5fd1a5d5269c4fce34/zisekemidilexirinepuwij.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/0a7bd7e89cf675dd926b8789bbae221f/wenemikaze.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/9297029125.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/70ea980fc7448c0627fdfb9c499c22af/momomarofagefunarupop.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d36f60864---7684626367.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/205e9a55baf916fdc4ba7eb534e8f4b1/83668796665.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/b9c1fba74bb08e725fd322b2524e4406/zakobofufa.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/13610156478.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/3180f81e7bf1778e03c80e6f35fd1cbf/makunofovi.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/f8e4e750b011e26f38de754dfd1c7393/tutezupapuzobur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=refraction+is+thePDF 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_off0000f22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22A 17500 bytes
SHA-256: 4f1ea259072f4e95ba6cabd4af9a5ac189af252b36240b718237b78b7c3c2829
font_01_sfnt_off00012052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12052 10432 bytes
SHA-256: 13dd34d5bf0fd8ef3185d8034b5b493d06a6fca96cbdb1177a51cb7ac4e55e2e
font_02_sfnt_off000137f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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