Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dda61c93321e346…

MALICIOUS

PDF

85.7 KB Created: 2021-09-03 14:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5e8f3c54975689016af58cc66f162da9 SHA-1: 28d23e5314ec948b2acf3a661324f2c45474741e SHA-256: 3dda61c93321e346a0d7ae2470ed4f71e3cbc04500cad4aba9dbe4d49cc9e49d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of 'utm_term' parameters suggests a phishing or SEO manipulation tactic to lure users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=cricket+information+in+english+pdf PDF link annotation
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/aaab440c81daa7d0fd5ae7915d71ab27/rozuwovopas.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/41886615190.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10b724b0b3---mumotevewasanu.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/fusejajef.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/28320398606.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/9d74370ad5b31e91bc376a96ac7e405f/mobunigujovonuzavuloj.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26ac73c824---31594509040.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c09207721f8---nevagazoti.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a5e034df9---82376765138.pdfIn PDF document text
    • http://geose.ru/userfiles/file/22807227718.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705c7a76ecd---belokojefewineboxi.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160dc3a6cbbcee---jibipuvexiponurexojesofut.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/nosanuborax.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/jakigub.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zojuteniwidubezepal.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/2d98e99d6619867bc131dc51fa716358/kifaniwurosifixunokeju.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/19854161427.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/xupoxoxifegukegevebute.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/32796862274.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/zuril.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/16207204063.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4df3b44058---39283911066.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82763e5196---tokolufigabimumofixero.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/gisopusawiviv.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_off0000e94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94E 11192 bytes
SHA-256: 7a5c463a068f2a443f9de5fbb6cc2f0d698c7bc3f95597f6a64de87324e579c7
font_01_sfnt_off00010326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10326 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B38 17876 bytes
SHA-256: dbee7983968a55a1087a659c9596c869e4718f2b86603031a52653abc4a148c1

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