Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef88c9dd5ae61489…

MALICIOUS

PDF

72.9 KB Created: 2021-06-23 13:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 4da27eda3549e861ebaab2c188be4378 SHA-1: d30ed365b21cac22dedb1ac7f830df8633090611 SHA-256: ef88c9dd5ae61489d9583a7ded7cd751a7994e50991ec84da02381959b6b416c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document employs a social engineering tactic, specifically a browser extension or update installation lure, to trick users into executing further malicious code. While no scripts were directly extracted, the nature of the lure suggests potential for JavaScript execution or exploitation of embedded vulnerabilities to download and install a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/ao9q2m2ioatp71p4p36m7tu470/17738024750.pdf In PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/03fc40f59f6ca0f993b07fa81d325940/75066827470.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/wosef.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081e67227bac---65839543073.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/17959823893.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/6b5b5af5ce453bd06a23c10c126a1d5b/liwopemixuvototise.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1cea3e179---85312950467.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/30bca2e939a7fd4d38b0f08caa765dd8/zipetaxazafetaw.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/kuvejetet.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/kovetowovaxunaze.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/iq12sol87ooakaaibd2pj34721/kiwovoleworokedatanovug.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b1fd75ff4---79454194645.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/e383e6c0f8cf3ca8a667a223e428ff85/8478523497.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b561b0604---lewumopipeki.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/58539833290.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/tojolanin.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160878a7a17c6a---43946906102.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/wonufib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=pdf+size+reducer+to+500kbPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BE 5072 bytes
SHA-256: d5d244b2c15bcacfa6238c804accf206d1efd3561b5a84ae526716f58fb45884
font_01_sfnt_off0000e320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE320 10996 bytes
SHA-256: d0bd3add696fe2decc28024f53d34c3a538368e9a026842892a104b134c8683f
font_02_sfnt_off000108be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BE 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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