Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fd7f27ef1e46269…

MALICIOUS

PDF

76.3 KB Created: 2021-09-19 21:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c4611a8f687a7eac2035ba3595456556 SHA-1: cc6ee3b5cc4d25efb61d0f6d87db2f082144204a SHA-256: 0fd7f27ef1e4626985337856f7ceaa9632dcf689468a5ae2bfc7c16c4d0d5225
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded content indicate it's likely part of a phishing campaign, potentially using embedded JavaScript to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://cructi.ru/uplcv?utm_term=how+to+get+the+fire+shotgun+in+modern+warfare PDF link annotation
    • http://fermobkorea.com/userfiles/file/20210918193808.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4e3ac0043---81136326516.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/2215926162.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091707571139.pdfIn PDF document text
    • http://waxparadise.pl/userfiles/file/wirakedo.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/c53e2ff27c9d3e08aa4d09392de540f3/23687678191.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134022f274b5---11235258018.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/panumoxinodesavibezaxomen.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/kujuxogulagotin.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/moxalunobekosadal.pdfIn PDF document text
    • http://vtaky.sk/media/file/22052471961.pdfIn PDF document text
    • https://kaparatt.com/images/File/73552339850.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/42294989811.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/nonawo.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/zelavadaw.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/vikelalofiduge.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/40340885697.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/2635957392.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/161468eaf3174a---66507271629.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/49655752307.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090516233219.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/xudetuforewe.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/bemodadoni.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/55859720074.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_off0000c5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DC 17352 bytes
SHA-256: 9f92ca6c820fa75714e231e9807e00d99525b0c8a18a2398e92c4ebaf34fede0
font_01_sfnt_off0000f25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25A 10932 bytes
SHA-256: 005333ccbe564a981e22bc6e9234ef124fdf1e60e16ee9e0434f823e3d558ae7
font_02_sfnt_off00010b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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