Malicious PDF — malware analysis report

Static analysis result for SHA-256 2234167d339f136a…

MALICIOUS

PDF

76.1 KB Created: 2021-09-19 01:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8f0feec1f4e37eb3e773216c8db2505d SHA-1: 704e50f42b132c16da13c7845a0b37cdc81c3cb7 SHA-256: 2234167d339f136ad43ee381e0cf0c4adb4556491c2a45032bec670e6849e3f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially harmful websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://pixomot.ru/uplcv?utm_term=best+duo+combos+fortnite PDF link annotation
    • https://vaitinhdien.com/app/webroot/upload/files/8363343369.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613180948c1d2---32732134317.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/rowekiwugapivududo.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/mokigigogebipivi.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/loxam.pdfIn PDF document text
    • http://apicn.net/upload/files/49285051342.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/pumulitujetomajenugozuzed.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/723c9f3e708d8e8f1d5a8d4478a69cc3/27017716697.pdfIn PDF document text
    • http://kim-clark.ru/files/file/25426910956.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/wofabowinomosotepawaxan.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/getimapedemis.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/sararenokirorosigedisixux.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/33781339610.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/vovetawobinuxibefewi.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/tokunoti.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/p6g39499e1g6ao485l8vpdlvfv/papupoji.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ece1bdb3a0---numolukiv.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/13909005873.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/38968206299.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf178b0427---29722397702.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/mikenolisolejeni.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/texofalepeximazagi.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_off0000c486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC486 17752 bytes
SHA-256: aa6db3a58dfda50772bb0b2a2db06b03133e4472ef2e30546d51d5791e2a348b
font_01_sfnt_off0000f249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF249 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A60 10724 bytes
SHA-256: 5ce65dd32627ba39141662385c2b278a64bae5febf13f8ebcd82b77889952b58

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