Malicious PDF — malware analysis report

Static analysis result for SHA-256 88112015377d22d7…

MALICIOUS

PDF

87.6 KB Created: 2021-09-04 09:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bb577e68ddfc6060c838b293c48da50f SHA-1: 780764b78d558fbb811e0b5c0fb7f7c965ba90c6 SHA-256: 88112015377d22d7e124eb258ef50aca22fca4bcb8587bcda578f557e5acb5f3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted from this sample, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://aweibel.com/Photo/file/32440616962.pdf In PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6b02a7816---8293299052.pdfIn PDF document text
    • http://carszana.com/image/upload/File/37490250071.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/80792377325.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/16918301076.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/13207718167.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/panugimizibopexiramenizu.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c94ee9317e8---91839086466.pdfIn PDF document text
    • http://indel.sk/userfiles/file/rupavekil.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/96430843018.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/6c5c27c8c50944e6262b1718be5fd70b/22027794998.pdfIn PDF document text
    • http://www.heksan.com.pl/file/lowegorugivapiparenak.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/tegoweda.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/nijomokob.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/jofajebuzojun.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160756cda83143---38435805064.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a63556a2de6---vatakajawuzevawadijilo.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/55527531926.pdfIn PDF document text
    • http://dietmoitangoc68.com/upload/files/zibolidenoro.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/17593518979.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/tumaxewesujopife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=adobe+acrobat+pro+x+convert+pdf+to+wordPDF 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_off0000f028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF028 18500 bytes
SHA-256: d8821aee8dc03a39d8f6e97904cd20a6bc59859c20b9e1b820945e63fd5993f4
font_01_sfnt_off0001205d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205D 10680 bytes
SHA-256: f0618d8b18fb17303aa16b9e5fe188545ba115f5e669e9dfffdc09d7f49fc5dd
font_02_sfnt_off000138db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1