Malicious PDF — malware analysis report

Static analysis result for SHA-256 142c0570939da4f4…

MALICIOUS

PDF

128.4 KB Created: 2021-07-31 02:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 89ee3f593839d1d31f04302cb44d9e1f SHA-1: 6dcf942bd5b32266e692d842a808d20c0f6ba22f SHA-256: 142c0570939da4f41a1e09ef551de878ddbfd308520b52ac3e49c6cb26f955a4
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised CMS platforms or disposable domains. The primary attack pattern involves luring users to these sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba641d7bce2.pdf In PDF document text
    • http://magogaralbamoble.com/galeria/files/48220754354.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/bff3a703b2e276202cd186afe745e31a/pazenomofowalutor.pdfIn PDF document text
    • https://scanclean.bg/upload/ckfinder/files/tovokoganekisos.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/f225fa3885ed29b6a4ca7bf9a0e0e7fb/90590876973.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16086b321d1d9e---57770751463.pdfIn PDF document text
    • https://mollis.rs//files/wewiravow.pdfIn PDF document text
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/deteneduzurikujo.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/46831104686.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/0021e9b54652856506c0ec84eee2f356/bokebekipesajutexuraxabo.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/fogusinodasu.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/galelok.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/remedugiletajineloma.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e90de0635---38991972063.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/49280407825.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/748425d9417a3d9421099ffdec86685f/xanerirajo.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/kokugofanaxogeji.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/64797eedfe1147e957fcad6ee01cacb1/sogiwolakunozigefuvipa.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16097d6a8bc21d---kebikode.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/79708112921.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8a361df8f---saferodiwad.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/77155065069.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/getozolufebefaranuzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=one+reason+for+the+adoption+of+indirect+rule+in+british+west+africa+wasPDF 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_off00019589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19589 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001ad9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD9B 17112 bytes
SHA-256: 885b3a4f05750b8f8fa7e8797dad189d60a0afd2583f7557fa8164f9a0767e6c
font_02_sfnt_off0001d9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D9AD 11068 bytes
SHA-256: bba0faaa5e4247a132ae42b1e9873d8033f918dd0ffedb473acf45ffd8bc903b

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