Malicious PDF — malware analysis report

Static analysis result for SHA-256 637afec9fdf04c9f…

MALICIOUS

PDF

80.4 KB Created: 2021-09-16 22:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fc61e4d320a2cfbde23a40f81dffd0bb SHA-1: 883f7bc1dbdbc6cae6741743309f36c95825a109 SHA-256: 637afec9fdf04c9f27a1f12e461254896f70e00625f229dcfe9e643d75ffc127
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded JavaScript could be used to further obfuscate the malicious redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=playerpro+music+player+apk+download PDF link annotation
    • https://decisionstogo.com/fck_image/file/61663292914.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/67687394128.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/76557964772.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/7900269726.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/28476679200.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137123315a3e---37545284528.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/kurujafo.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/21136979694.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161415f090e8a3---pedal.pdfIn PDF document text
    • http://aa-nusd.jp/47608571071.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/dikosumijev.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb5fc61b86---jekuzipanuxuweradi.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/76133537740.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/tugelegozilogaf.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/29246356964.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/93852183115.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/petilumoniwelunekato.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/gesepewim.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/97142756282.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/98938221821.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/cf74b0ac12117a52e3715318bcaa9be5/pawer.pdfIn PDF document text
    • http://nenorm.com/files/files/xowisewisuru.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/moresuse.pdfIn PDF document text
    • http://podushka.by/files/files/8042662909.pdfIn PDF document text
    • 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_off0000d44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44D 17572 bytes
SHA-256: 1af277ab54e991a639f523fdba8b4d1caedcf2842a963bfb6ee1530199768f21
font_01_sfnt_off000101f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F9 10968 bytes
SHA-256: 80ced2f4fc221d932a6120e4ff8a5a5c382e9ecb17390a82ab92f79e8be22149
font_02_sfnt_off00011b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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