Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1d7d2115d6999c…

MALICIOUS

PDF

110.6 KB Created: 2021-09-07 18:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8d00cf4d9fa65c1af68f0fdbba18081c SHA-1: dcabd8452238d068a5b9e511bed99582da37625f SHA-256: ef1d7d2115d6999ca967bf775b9e756e4fa5b94d31f6b6d50ac48fcda6929ff3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads, aligning with the 'Spearphishing Attachment' and 'Exploitation for Client Execution' techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/19rfom3ihm9efkeug5up0lar3l/bebavanefavunetisorejoji.pdf In PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/c024cf0dfb5a725216d5dcc974924ff9/51567438300.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/tafujemap.pdfIn PDF document text
    • http://standardamulet.com/files/files/55922253847.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f25b7267e4---46690036524.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/56185655442.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/zupegaketuruzorofemus.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/wumomojasidariwudu.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/34127772005.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/fuganojegenupenarux.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/eeuiarveq197c6n9di4pq889a5/magujuxovewutovunenaw.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/98281546760c8e39443762.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/26445025346.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16094182b58dec---12795315204.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/980550184f4ea158c5848e0771e41f91/22754579619.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/ramekupokafugagot.pdfIn PDF document text
    • http://kasargod.net/uploads/file/tubola.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/982e99e0517220d12e4c96e78f6625c1/bebukisinotosizoju.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16204082045912.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/fixirudokinodukoxunav.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/panunexuzolarerijogeg.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609acc6aef8a8---35937507691.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=practical+creativity+and+innovation+in+systems+engineering+pdfPDF 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_off0001477a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1477A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F91 11144 bytes
SHA-256: 425c905e1f000a372d1cf739882fd3de1ca0f2029c7a60e7613faf62db93de6a
font_02_sfnt_off00017968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17968 19532 bytes
SHA-256: 012d2279f3183407f57e2a69e9721be8d6ca947a1fbc4d0ebb2f4ff752c273c3

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