Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d43de22c7f75f84…

MALICIOUS

PDF

104.9 KB Created: 2021-09-02 19:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2803347dd42f7a5e86c3054b9259eff7 SHA-1: a6419b4106bccf30072aa12ca9659f4fbcf9b282 SHA-256: 1d43de22c7f75f845c92dc0842f94c987cf70ce5ba0df784102fec5860aa0e4d
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 malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that form a link farm, with many pointing to compromised websites or disposable hosting. The primary function appears to be redirecting users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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 http://eakqshop.com/ckfinder/images_store/files/57063282410.pdf In PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/31818624256.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/ccf424fefadc614e318c42689f1207d5/22052318400.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/67040476025.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/23436022018.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/52405563880.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e6ac38572---gijuvalafigoludinagot.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1628095457.pdfIn PDF document text
    • http://leguido.net/files/romof.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/rrckmge61329dvf91vbevbuod5/rerav.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/f67e61d8344a0638c4811896b982043a/89726989793.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/bokuredusalija.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160739f7bb1414---75389184550.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a365a7a8e---22053127309.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/4623105459.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/r5ia902hklorrrho70hj9tl9n9/16843448223.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/47872328170.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a66c6b16c---56699062737.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/bcc7d8c153997bc12a303e6912194dcb/47905218156.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/11322068019.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/6439dc37a318824594b1441c678ee9f8/68364491119.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/34848732348.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/513a41938a610e90f8c665eb01aeaead/48856635499.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/49732214043.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080846ed8c36---surikoletepudode.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62adb89843---56916503182.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/mobodalu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=trade+off+theory+of+capital+structure+pdfPDF 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_off00012d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8D 20792 bytes
SHA-256: 5e1c3ad7f28aedd7e2b72fd3e70f222532cafc9687eca18a867d68459d3a07af
font_01_sfnt_off00016409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16409 10792 bytes
SHA-256: d924f5ab471302c46a4f89113e31e840d13695e656d57ed4dcbfadf2e2034403
font_02_sfnt_off00017d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1