Malicious PDF — malware analysis report

Static analysis result for SHA-256 898487f69dd29cdd…

MALICIOUS

PDF

116.7 KB Created: 2021-08-04 01:41:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b0db43c2b9d8c101aaaba0ada70b222a SHA-1: 3a221eb73e0a84898fdc343cab59b18a99991b1e SHA-256: 898487f69dd29cddfa8f52c94b2a5151721f7bcba47b4d190fed1d10f8d2641f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites. The primary goal appears to be redirecting users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/nfl3hsv24f32poa9mod4ddsfcm/mezasosutiviruwi.pdf In PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/xakifojugeduta.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/71917bc3cdb234851ab42b1e49caea02/56448411692.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/36156379295.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/wovijajojiwedefamol.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5eebe12e53---kamutusarelafamigutow.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/nexupujelapoborisiw.pdfIn PDF document text
    • https://mszukam.pl/dat//file/7858598026.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/jaxedusediredaxifogevuno.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/vimerekegomijakaso.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf54eaef08---30467531588.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099b8bec46b7---23758667624.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/vunozinatewisevef.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/35388559389.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/jebobivus.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1310a82e5---mopexer.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/ziraponojitepolotapuxono.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714b015b296---bemowurugomisedagaxinaruz.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/96862961381.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/07adaa1e15bb00966b21131531dc35b9/vevezalogitenunil.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/28001415549.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/4c2deeac1b24d0b612a890f8161ef0bd/72618786281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=what+channels+are+included+in+the+directv+ultimate+packagePDF 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_off000164de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CF5 11092 bytes
SHA-256: cbe3367db26c20cc0974085edcf20e89c4363e536da109221be230bdf44c79b2
font_02_sfnt_off0001966b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1966B 17432 bytes
SHA-256: 6738354b4a8e9d4967be999574febe4c3d66f1ee27abb631ecdbe93d37084958

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