Malicious PDF — malware analysis report

Static analysis result for SHA-256 5309c0e00f5fecca…

MALICIOUS

PDF

103.1 KB Created: 2021-08-22 01:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 82d4bbb5d0944367f1a7cdf7dd981173 SHA-1: 0e75e919d5d0a5073c8ec228a378cfe92268741a SHA-256: 5309c0e00f5fecca5be17a3f6feec179b2b5a17daef7f9f1265107f45244eadc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as 'https://coretry.ru/uplcv?utm_term=milady+esthetics+workbook+answer+key', are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://coretry.ru/uplcv?utm_term=milady+esthetics+workbook+answer+key PDF link annotation
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/6df148b4b691d0d6d1d1d63c7b49d73f/74400334392.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7e47a8ae6---47621332068.pdfIn PDF document text
    • https://ubranni.com/uploader/files/87198341220.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/2409313238.pdfIn PDF document text
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/39099828495.pdfIn PDF document text
    • https://drsaman.com/files/kosesefamatimi.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/bepiwuruxomez.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/katasivokipul.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6d4871e6d---zonotubigenaxazesomofot.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160807c866aacf---87842039568.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/pj3im2a6ua0pkt8br57ghsk3c2/jolusogozojogawujakemari.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/d102409a50826afe09a765a301aaba78/varovelol.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/27270168158.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160941db49c9c1---57548714937.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/satuzetotojevuviwagaja.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/wepukesuvotetizuvumeroxef.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084f53c39a7e---xivejefaxinososanogaferif.pdfIn PDF document text
    • http://japhina.com/upload/file/58980458972.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7882543ef---17365184224.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/nakokopimurekukok.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/zidoniwidiliziku.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202169111118.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607974b78a539---24269366833.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b36558c3e99---jigopo.pdfIn PDF document text
    • http://pronobile.de/catalog/file/82654880928.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/71476372549.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_off00012bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF3 10892 bytes
SHA-256: 3afababd0a7af42e0cefa1c3b2db275b872cf8e722d996ff796952fa021d1317
font_01_sfnt_off00014524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14524 18672 bytes
SHA-256: 132aecc2f29f79385848bc27991304f9fb8986eb2e9f174bd1845e8a71289acf
font_02_sfnt_off00017519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17519 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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