Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d2bd832e1aa54b4…

MALICIOUS

PDF

75.4 KB Created: 2021-09-06 04:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 99dc6c62737c710db21c3a7662c3d3f8 SHA-1: c2e4f7ed005e674612eb0f30873d82689f9e58bc SHA-256: 6d2bd832e1aa54b4511eceecd12174e2f49f3f461de8aca13fafc6666dbf96c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 distinct, potentially compromised WordPress sites. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d59e5bb0a2d---rabowilesafedadolep.pdf In PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/42993f4c8e443e2ac467e8b3763ffffc/sifolavexabusud.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b00b051b481---46723251463.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e114bb956edce1c04e43641832e13167/64332647781.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/62454659273.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/wasidibemerabofukozujuje.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/4lqjc3r8tjn8vcnakr494inm13/vezoritifupodasa.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/suxomigeluwufumaxekirit.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/12353015834.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/49cfae979096ed8bd26b52e0ae3dc054/23655699894.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/22965419221.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/f500a6a2278f3af090477b8c2043f6b9/sitikurena.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/xidenegonasanod.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928da5da5d3---26460193221.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613553ae15f21---751423691.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210808_4315876B8D250D4C.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/69323527507.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112832b3dee4.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/ac7e4677eb51f84596866734305f1bb5/14870894798.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c75ad0b2a---wagalepigetujekezovot.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210715/file/somebaxoraxulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=csf+test+procedure+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/516c9c9c82718118ea89589912b8077f/69742297095.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_off0000c566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC566 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD78 16672 bytes
SHA-256: 45976f5b14adb8e71d438b1902b247d4729de3f69b244126346b2c52c4856abe
font_02_sfnt_off00010888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10888 10340 bytes
SHA-256: afe4a1273c9e29c5fa28bdf7ae6dacb86c3fbcc900a1fff4bac94e62d3ca3a76

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