Malicious PDF — malware analysis report

Static analysis result for SHA-256 71937855435448d0…

MALICIOUS

PDF

90.9 KB Created: 2021-08-07 00:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 30608db324e4b5396f509f4584873170 SHA-1: 14368dae68b431475592ab4c05fd7fff07142d17 SHA-256: 71937855435448d02bb4e7923e30ef20329f36f1a0ebd0453d5b81f3eac8ebd2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains embedded JavaScript and a large number of links, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of embedded JavaScript indicates a likely attempt to execute malicious code or exploit vulnerabilities within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://atolab.it/wp-content/plugins/super-forms/uploads/php/files/ce7c62491cf9facba58810a678dc9ba7/16391922929.pdf In PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/6ae07367857ff17453c5e8b9daa9ea17/37887875391.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/d398dgf944lvfi6cc2tmem1md6/74644606228.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5dcb4462be---75471040433.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/g504ahdaqpvo4760u37b7p8l7d/51654949518.pdfIn PDF document text
    • http://wjcopy.com/upload/files/85773680192.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/cc96ef0dff8aaf2f91ed698ed6f36824/ruzotawidurupuw.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/86bbaca1cf416fe3644ee15962fb883e/lofopesobuxilazujejewop.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/c94e821e03f06bb574db77c16f8877df/41113238694.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/17c033bfe1e6e0f784291f0723e5b27a/53342181289.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/fowolosorisowepomewifazu.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/serajukuniboxosaginiwedak.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c426e9b01e---jedip.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/19467818462.pdfIn PDF document text
    • http://gibisch.org/files/files/mobamofabodoteneja.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/82884782377.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/741e5869fafe5f600af845033a75fae5/gobugu.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32db87b26e---84967491065.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/95083710710.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/on6he7e4jkejl4pmqk0q4t0nk1/kadelobawesumojobaperej.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f57cacbd177---makud.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a0a5f0abb6930335818490668ba326ee/633680601.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/97208061743.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/dazexetokopijowomas.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/6047047469.pdfIn PDF document text
    • http://51www.org/uploadfile/file/2cca3d9e99dbf5ad6831b1477bd5fb8d.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/27986936628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=can+i+play+roblox+on+chrome+osPDF 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_off0000fd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2B 17648 bytes
SHA-256: 10f15b9a62730a123446a5f5b2dd80d2859042e6ea2abc5bcf3b8087ced4e375
font_01_sfnt_off00012b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14357 10928 bytes
SHA-256: 21f1250faab352223a52c5894c1807a30b1d49bf13a6982d7fb6582faf32ce3f

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