Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d4aad931860e1e0…

MALICIOUS

PDF

78.1 KB Created: 2021-07-20 18:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8933edb0c2248d28cdc5b8e0d2d73d85 SHA-1: e3bf80bb8698ea64d02db7a6650f5371fdcda474 SHA-256: 5d4aad931860e1e05a1ef9d5cc23600c41b0c5d7d7c0f7b32978a3380e67dd4c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to domains that appear to be compromised or disposable. The ML classifier and ClamAV also strongly indicate maliciousness, specifically classifying it as phishing or a trojan. The embedded URLs suggest an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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 http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/68aevb386dal7s79kbp6om2k64/17476481772.pdf In PDF document text
    • http://fructusartis.com/i/File/48792705321.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/gotuvezebifiva.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/jetinixojij.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/48057247246.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210506221627629.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/giwewobuwulowusigaz.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c32c10649b---92601614519.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/mimidoviv.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/40290041286.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/j4cnuqfk1v28guklv3o1537sna/kadivan.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786a1b56090---burobebufove.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16094bccc29f36---77369294944.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16074dbb5b07c8---poxaziredosafagoxox.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/6bc67cae49a599c898390719622ff434/dufapemevefam.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d765179b68---88582485531.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/71726484133.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/wuxekoputesemaderoru.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/5c4ec752018d18cd75bae6d5ba901ca1/nubusowudesivoruruvipexu.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/80122627310.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/20d22639fee216b689d8edcc12715d4c/1205948127.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/7ciklmajifprgmqelnpshl2mk6/sixiwunubinizeb.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/57993956480.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ef0623b9a---61004276966.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/bepodakijusazojonufake.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=answers+to+modern+chemistry+textbookPDF 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_off0000cc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41E 17480 bytes
SHA-256: 4418eea32d6f99148092d1e1b457384dc8ff3952db24d766c711677aafa0da03
font_02_sfnt_off000111a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A9 10940 bytes
SHA-256: 50eca79eb7d7da581782617c1ffa3192619f36c478e95370bb601ad88177ef29

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