Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ac07207cc99570f…

MALICIOUS

PDF

84.6 KB Created: 2021-09-02 08:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9579d2b79464477d48c456043c936b50 SHA-1: 61922332f79b6dd32e4c82864663e602db8effdc SHA-256: 2ac07207cc99570f214c19be182d803d94f283bdc82329c24c7790896263f143
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains an embedded JavaScript stream and numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be redirecting users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nomylo.ru/uplcv?utm_term=minecraft+cave+and+mountain+update PDF link annotation
    • http://kemenyseprosiklos.hu/upload/file/2186465673.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd07a49ab92---99407443556.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/ma4nfndl5kun4nbiv525thp2lc/nimet.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/toredimutokawotajo.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3d5b2f7c3---9390430801.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/fb8e5f76b8953afa0c9cf2d4ff879256/76423666827.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/070424272348.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608735684a421---78582312491.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/sosuju.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/51047382090.pdfIn PDF document text
    • https://makenie.com/upload/files/35234583844.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/4590531e6472bb6cb0cb5cfc91f7f600/zajomaduxunatabivoges.pdfIn PDF document text
    • http://roxburyhs1987.com/clients/63080/File/74450764641.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/xabiv.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/69951359147.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/jeripuke.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/fadupunexafaz.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087c74435917---4575925091.pdfIn PDF document text
    • https://defaico.com/d/files/pevusam.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/68165268107.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758e1c5394a---30521487557.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/tujiko.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/zinedusezotakovitu.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/bga72ac4i8kdmoev52nqm85sr7iukdnh/koranuwubogalulep.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_off0000e594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE594 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAB 10724 bytes
SHA-256: ea9951c0b8d426918e6d869c90773183b48ed9a733f862341c1e9b7906db4d05
font_02_sfnt_off00011650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11650 17628 bytes
SHA-256: 3de421d203a56943d26df31f6c0c5c4fa5e311be848ed4b6645f706961fb8f50

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