Malicious PDF — malware analysis report

Static analysis result for SHA-256 8121496f25b2ec5b…

MALICIOUS

PDF

80.1 KB Created: 2021-09-03 11:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 502f4a1db6142c5104075acf8b3fc70e SHA-1: 2e3252e3dd116d91d72301a652b901e70d171c05 SHA-256: 8121496f25b2ec5ba0f65cc93762b03d1315c147010d2f1d160863cff49dfd81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely serving as landing pages for malicious content or phishing attempts. The presence of external URIs and link farms on disposable hosting suggests a campaign to distribute malicious payloads or redirect users to fraudulent sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://krisoc.ru/uplcv?utm_term=free+math+worksheets+double+digit+addition+and+subtraction PDF link annotation
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/9e83d2c73d0ee94ac469447a6f3fc228/22109729545.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/el64gfahc7nu7b2059pr5s0f9f/32243570602.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160915f5fed881---mesatagejamelite.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/50a19c7b56ead95ed8a5a60000d8fa44/95412376810.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/23490943364.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/1e8a29295883911c7c3338e264d29818/paxujotoregipo.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9649f1c47---jagus.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/kisilefanagofofaluxe.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/27797176919.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db71d9894c---743926563.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddb96652c85---69420895697.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbd4f5eea7---bewizopoxa.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/2npi7tlkfbq2adet8knfqi6dep/xegefegari.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/b24b46ad0a8603691ce8fc65b9e7e9fc/77101049550.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/81884170651.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/66684146439.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/fajajoruruxupawakirat.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/sekafo.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/58172397303.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/motenetiwim.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a57fe5ef4---42642827796.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/92083910715.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_off0000d3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC05 17308 bytes
SHA-256: 24d6fee62a278022d9c9b5d25cef38ca3211039c9675a804c5e15b2fe8cf3da6
font_02_sfnt_off00011868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11868 11212 bytes
SHA-256: 9a38bb03509065bd001eb05c20f229284472cb70f672308b7ae830b82886f075

Open this report in the interactive analyzer, or submit your own file for analysis.