Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e87f4cb24f32f7e…

MALICIOUS

PDF

88.0 KB Created: 2021-08-09 21:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fdbe185176791fc5fad4eb52d27055b7 SHA-1: 59cdf361dbddda0bd1155265139269a94538e777 SHA-256: 4e87f4cb24f32f7ea36cd1a628bc258f2f9630e2f63ce9e76ac18191708d3a21
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable domains, suggesting a link farm for SEO manipulation or to distribute further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://csodamalom.hu/files/files/lalosodugabavebe.pdf In PDF document text
    • http://uchid.com/uploads/file/tikuporuwarivovawe.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/66601619685.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/hmfdl6gb4ttl0g8n6bsgouil65/gugegabitadedobafawibala.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/sh043voh48jh1b8qargo4k8en6/93877661900.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/medofazasugediboxuduxove.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/82467384357.pdfIn PDF document text
    • http://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/suduponaxagetumik.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/1db4aa87003f67b92fb86539bf1e1c24/mogunesojukenabonisuvorat.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/luvonabejozigalagud.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160e6cf859d28d---34558393472.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160739a23a7e0e---15826278182.pdfIn PDF document text
    • http://slp61.com/clients/e/e2/e296dcecfd7d10ffef0cc83fef253c72/File/2446458052.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/46374301490.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/nezotobewejisaz.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/2bd8297937e3c51514e3c2ca13f028d7/99759943380.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/cfed46ec7522bebab8ee62aa55d186f0/zupipi.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210727_561AF99AC83E2468.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/302136575eb9c8dcc263696931da7835/3235369858.pdfIn PDF document text
    • http://www.77ice.com/upload/files/batipobul.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/nopixeritomo.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/donililedijibapuwamebofi.pdfIn PDF document text
    • https://bkht.vn/userfiles/file/luxodevi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=cinema+apk+on+firestick+keeps+bufferingPDF 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_off0000f206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF206 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A18 17360 bytes
SHA-256: 26b286cd4b2f570992ac54592e4e76b61b2ed917f74e63ae15eb5b127e02c74d
font_02_sfnt_off00013740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13740 11140 bytes
SHA-256: cfb1e6b5376309ea908dec72c53b0737ac7335335f86102c4b8f8768923651d0