Malicious PDF — malware analysis report

Static analysis result for SHA-256 52c3ff403f17b7f1…

MALICIOUS

PDF

91.3 KB Created: 2021-06-29 00:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c3a501fdee4274c133b594d20826af59 SHA-1: 0ea813dc359ec53691d36a18c5415c7925406475 SHA-256: 52c3ff403f17b7f12424a35fb17d06f393ed168d0ec327e7ff29813d6f0a265e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable hosting, likely serving as a distribution point for phishing or malware. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=cannot+open+pdf+in+chrome PDF link annotation
    • http://ed-web.cz/userfilesfile/danamotidola.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/rpkn4og53d74p9u0aeseq9sg90/8018028346.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d3365bdf220---tukovomifibex.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/p455der1o1iobv960j44cml50m/28746557306.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/fibuwazisatopizadave.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/xuxodoxogosobuz.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/104a2ef82389f74508371fe6bf40f6f8/robokoxinurunolewafog.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a535f149d---8963147192.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/8refs4459vn6f4gcpmjvcb5bks/76788540466.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202162614729243.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/mavirosuxanafezuwajam.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085328586254---63840461400.pdfIn PDF document text
    • http://abnicum.com/files/file/lokidilupi.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/f784b41cf6012c2d5be19504bfc6ab98/50236620126.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/xoxirezukunoferonumil.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/bf507e95d105c8dc14c37c2474d3113d/32886451049.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c672a3c3f48---15794482353.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86e84140ce---46105648530.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/5ecevc2mmu365hhtvqhmtlkjc8/71061243928.pdfIn PDF document text
    • http://614move.com/clients/4890/File/68503486053.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6cf142b3d---47033356594.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/74502982822.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/6e9636e6c2eb8be62da30e44572a41e4/bipuwux.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/ropixudujila.pdfIn PDF document text
    • https://inifd.london/uploads/file/vadifosuwosipovo.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_off00010245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10245 10704 bytes
SHA-256: b27da7a50b198f5021d39fea77d17b50afaf743c80f815c5dc8d43b2a86b8e70
font_01_sfnt_off00011aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B3 16816 bytes
SHA-256: 03c43b724bf29bdea284cb6ea9bb054feb4d15e1613f420662591a04cb0582f4

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