Malicious PDF — malware analysis report

Static analysis result for SHA-256 5479a9c181a8e943…

MALICIOUS

PDF

79.5 KB Created: 2021-09-04 17:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c5637f84be5105105fc1a0546d14c710 SHA-1: 312e00c49da9e2b79b7c464ed3179f952d4033ef SHA-256: 5479a9c181a8e9430f6bade0db2862cdf14baba41c3170b624055a9f6e82bfeb
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories, suggesting a link farm or phishing lure. The presence of these links and the overall PDF structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824e0ea5e2c---navikituza.pdf In PDF document text
    • http://www.bluewhaleline.com/image/upload/File/japunifofojalavotupaxeb.pdfIn PDF document text
    • http://ahs1966.net/clients/f/f9/f93f52488d971b5f2372adc2bdb16541/File/63217783919.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b7cc7cafc---vujinewimulijaler.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/16734460061.pdfIn PDF document text
    • https://ocw.tw/uploads/files/dewizidovigasakujutorexi.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613025d1afabc---julanosepe.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f967f93203e---70162363385.pdfIn PDF document text
    • http://burnettefamilyreunion2021.com/clients/867108/File/73063530244.pdfIn PDF document text
    • https://unitjaya.com/contents//files/9039782560.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/kubudekolo.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/41984029234.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/27529398130.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/majeri.pdfIn PDF document text
    • https://majubesar.com/contents/files/63366240041.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/lafatulamuxapegotemunatel.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8b3845d98c---68532477152.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16072d9a5a58dc---xogutojaru.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084755d4dcc5---darimisigadivejo.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/fikurig.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/zukazekukok.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/25480844379.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/15701423159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=2016+jeep+wrangler+unlimited+sahara+owners+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_off0000d1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BE 11520 bytes
SHA-256: 194e90187563cb016f2160e7141b38bbbb527f96a5af0f76953cd94b699ad32d
font_01_sfnt_off0000ecc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D3 16740 bytes
SHA-256: ca312957829eef97980c569447c52af39c602ce8f1888e354d9a09b47b0d0243

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