Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e5a988b76481169…

MALICIOUS

PDF

75.4 KB Created: 2021-09-10 02:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 363693dcd3d03478c1a2b1042e0013d4 SHA-1: e5ee8f26af101be6760651be21fcd74ce36ae3b4 SHA-256: 7e5a988b76481169fd998ed109f35e97bdd04d4805e9bb3ac51c85c6d1fc1f46
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also contains numerous external URIs, many of which point to compromised websites or link farms, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://brs.jo/userfiles/files/demorasuwavafiwen.pdf In PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/55544773852.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/babex.pdfIn PDF document text
    • http://findusafranchise.com/files/files/62302233948.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/zujelogamex.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/nurizir.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/97326347104.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613714e1e1d81---tosadugosuxasek.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/29634388281.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/jejipunifudubekoromojet.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/zopamukej.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/tevufuj.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/piwefa.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16134a3d0c9117---21165837949.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/xedukowevuxomiziregixu.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/gepamuturawak.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/35243251764.pdfIn PDF document text
    • http://dogable.de/userfiles/file/61294036369.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/bewalisug.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/82442264118.pdfIn PDF document text
    • http://geose.ru/userfiles/file/49869312412.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137396f4c8e0.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/51686971992.pdfIn PDF document text
    • https://advik.net/userfiles/file/11781164890.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/bulama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=integration+rules+tablePDF 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_off0000bfe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE1 10472 bytes
SHA-256: e953e41d3a5e70014a993a51cccba29a7288b2e4b06017204e7d8d21b374bb2e
font_01_sfnt_off0000d7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C7 18688 bytes
SHA-256: e49a59e1ce303b41dd2ef91461a5e67aaee22e9b7d7c861230f2cb7f75b587a8
font_02_sfnt_off0001081f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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