Malicious PDF — malware analysis report

Static analysis result for SHA-256 6847a4dfe71f74f0…

MALICIOUS

PDF

92.5 KB Created: 2021-08-18 04:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9f1b006e7724bbad69f9c57d245de20b SHA-1: b1153327def3eb74f4adc33a2954921669fba455 SHA-256: 6847a4dfe71f74f0dc648126251173337657359bceb050a119ab5393898e2b57
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to potentially compromised WordPress installations and other disposable hosting. The primary purpose appears to be directing users to malicious content or further stages of an attack through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079bcec37ed7---49341983372.pdf In PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/991700096.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/vokolisobu.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86c1af3c70---latififo.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/84146187393.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/dabawova.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/28560775772.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/92659785060.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/7b104835013df8283935d105a83c7c1e/36011488844.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/konunevawe.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/55890479664.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/9b365e6602969ec2ed2648e7457fb6ef/sanokuguk.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/56802458468.pdfIn PDF document text
    • http://salwex.hu/file/puneruxinev.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bae7007ebe3---sijepijanujuwemilaxata.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/7b0bddc8265556ec191377f8f39c20ce/12880410881.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/e1e2aaf1e2abdd7dc0ddbefb457f1248/gipolunobirevexar.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/93936690679.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/e1cb65a55e469562d12aa4e0e408d741/wagokezimezarix.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/37550547103.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/o5dbdhjivqiv4jf9edg47lq1ll/4286487062.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/85163331361.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/1c898a664d58cbd45dc79d4d7d4a63b7/jawovepawelogonuwelizovur.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/e81e33808166ee93e2e0c4a043472f9c/linumovez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=exercice+de+math+5eme+avec+corrig%C3%A9+symetrie+centrale+et+axialePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10090 16100 bytes
SHA-256: 6b54a3f50d1a413a5c8c0ed289a9c866e37e8bd73df0b162fe7132700ce54c18
font_02_sfnt_off000115ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CE 18872 bytes
SHA-256: 8a5ef4a714442daf3b926e5a3e0fc293ba534f3d30807e9df40e190c86677037
font_03_sfnt_off00014574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14574 11372 bytes
SHA-256: 5df134c3a1ed808b8f5412b2f71ae8eb15999579fa4b4220ca74c3142ea547d1

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