Malicious PDF — malware analysis report

Static analysis result for SHA-256 935fca2767bf7cb2…

MALICIOUS

PDF

80.1 KB Created: 2021-09-12 02:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5f25e02ec7065be4c2bdc41030edfc3f SHA-1: 8cfcedba5680b1b84c9af315a37f8caafa139935 SHA-256: 935fca2767bf7cb23ada712b0dc904d776881a6333452a768ee7576e7114d195
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. Heuristics indicate the presence of embedded JavaScript and a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the execution of malicious code or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ketchas.ru/uplcv?utm_term=spostare+file+da+memoria+interna+a+sd+android PDF link annotation
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1cd741e14---39432270155.pdfIn PDF document text
    • https://securitydm.net/slicice/file/wimosutu.pdfIn PDF document text
    • http://vhz.cz/user-files/vezovepeliwe.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/83649691543.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/penanubukalegexikak.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/vazidoritok.pdfIn PDF document text
    • http://eva.am/files/8a7982b49d013946.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/xodamoduduxo.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/10296248453.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/49471409169.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/95351826620.pdfIn PDF document text
    • http://istocdukkan.com/userfiles/files/18653297143.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/38530884452.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/tazowiwunakovexugipeg.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/45704734666.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/badusupojuvedafe.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210903053848540197c3zp4.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/55832990697.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021091207043270554.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/sepepopifilig.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/3f40204e261455095fdabc480c291a8d/bikirofafovuvatilil.pdfIn PDF document text
    • http://e-instar.com/userfiles/file/wusadupisisiwuw.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134a9e86f259---fabawagimukire.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132cf3c5a981---74945376090.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_off0000d5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CA 10736 bytes
SHA-256: ef98b3fc8d951df563b460fe1278e27251c8ca9a1df25cb3813941fc9c0f0ef9
font_01_sfnt_off0000ee65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10677 17004 bytes
SHA-256: 4d169908cf2e80c30f9d0061f33ad487f6e747c98842648cf14ed04b9ef662b2

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