Malicious PDF — malware analysis report

Static analysis result for SHA-256 44d5bd5dd80b4c79…

MALICIOUS

PDF

69.9 KB Created: 2021-09-03 02:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c15108f91ecb2a55d7ceaedf30e7aa76 SHA-1: dd6329ec0a1273035e2452e4cf91c9f3c7da8479 SHA-256: 44d5bd5dd80b4c791e2898f63c88ec69897fbf6c1eed259f5e81983d9acd8294
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple distinct hosts, many of which are hosted on compromised WordPress sites or disposable domains. The embedded JavaScript likely facilitates the redirection to these malicious links, which are designed to lure users into downloading further malicious content or providing sensitive information. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • 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://cardion.dk/gfx/fckimages/file/36912908384.pdf In PDF document text
    • http://mnogonomerov.ru/uploads/file/ketiseparopir.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/duguzaximilokaxuwe.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/kadopabivixesebikuki.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/57786404637.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/7c1ijet4qh9baku6267oiq4ra3/72423517222.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/subegifetaxokon.pdfIn PDF document text
    • http://scro.ru/pic/file/fipivovov.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d0a2855d9d0---45803501970.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/dbbefd39051ce4a470292e5fe28e7625/28556849021.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/54438315208.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/gabopimuxaxibedajerur.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/tavusebiwokisuraji.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759086536b7---64175048402.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/21363585170.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/74044890498.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/6826751902.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161033f13be0ea---bemomevafiwofodebefipurev.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/79884353196.pdfIn PDF document text
    • http://xnucleus.com/members//member_images/files/negokumelegonanariwiriz.pdfIn PDF document text
    • http://kotolantopeni.cz/file/batibavifatawesozupafi.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/rigujasozaxis.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c673fdbf356---72585405748.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607da298a29d4---tabomojowiregazijobesa.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c037091084e---dowor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=glandula+tiroides+fisiologia+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_off0000b37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37F 14912 bytes
SHA-256: 4ef393fb66590a88bf70c8b63e3759b0aaac3e45155be1b3118771486ab02686
font_01_sfnt_off0000d905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD905 10812 bytes
SHA-256: 1fde213b6eef7186886afd42653a4fcc86d7705b506210611809e2efed0b426f
font_02_sfnt_off0000f1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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