Malicious PDF — malware analysis report

Static analysis result for SHA-256 6721f5ac3078a3bf…

MALICIOUS

PDF

81.2 KB Created: 2021-08-07 11:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7c25532610a748d79e7612461b89f831 SHA-1: de3c75ad33220a2bd20c4a3cc36519f9ee53fb3d SHA-256: 6721f5ac3078a3bf2a43ae1abb0ec44c2e6c84c2a0d99bd813d0034a23f35aac
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to lure users to malicious sites. The presence of external URIs and link farm heuristics strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/ede5f95ac6c39a0ec40f0015da34240c/jilakixanizifeve.pdf In PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d0baeb694---rezebosupapi.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210429012953164.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/jdhjkdo0j6csm4btlnos5hbjq5/66245424259.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d498693ab---56461960451.pdfIn PDF document text
    • http://shiokuda1.com/contents//files/diluzolubawavobededijojox.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/kibenimili.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/wazutenire.pdfIn PDF document text
    • http://gabortech.comadmin/file/jesevupizemedijofe.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8845ac693---wimakovakaxodipu.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/fcc8b91429fc7fffe5df65f7662dcd72/popalopizafokujiropopu.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/vozosifixoxiwugixob.pdfIn PDF document text
    • https://aspirans.com/files/file/47318082283.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa8596ba67---45760876989.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/3345389284.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/43417554691.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/dekubo.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/jalujel.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/8c81128958848f06436b9b805648628c/xolatimipuwajatimobun.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/4eb3934bfabd79be3b7f622fde282a98/tozamulawivitexiji.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/vebeguposalezipowod.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/segoja.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd57e4bb29---xemefadebodadu.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/c8744f9bd9d60df08633e8fcbf355170/wixenikapimanasika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=schumacher+electric+battery+charger+se-5212a+manualPDF 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_off0000d793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD793 17208 bytes
SHA-256: f85942d0ed3efc40198ecf9460d39ff9218a64b3c7a34a5d81caf38a3466807a
font_01_sfnt_off00010401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10401 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C18 11328 bytes
SHA-256: d6327a8e56babbd4eb385bac33541475d6f0c04cda3aecd7bbdbe8bf7e86e896

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