Malicious PDF — malware analysis report

Static analysis result for SHA-256 93ba21bf0cc6bd51…

MALICIOUS

PDF

90.6 KB Created: 2021-06-22 11:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: afb447c9a30a5e0fb5171677c77682f6 SHA-1: 527797a7593efacac380cbe646782fb94d8bdd28 SHA-256: 93ba21bf0cc6bd513c22e8e4d29da0726617a9097898dd616262a3c4804e351f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://philabc.ru/uplcv?utm_term=offset+and+cardi+b PDF link annotation
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/7eaji8jt62lkjb9lsi6mn2ct3j/11853236825.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/8af5b8fa30fc41c53bcd2118fe8c4cf5/nulana.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/5206d090efeb6920649397efa5a1f07d/29448413150.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/21957dbfa60e8ff1c4cb168bb482a82b/42027826884.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/9172760966.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/85d197c34afc2e33b02040333a0e8acf/6244682194.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096c02d99c0b---ritixalilikeguguwezixosut.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/5c22b5338b051e8ddf188b0e5bf767e0/ladaxomexetilog.pdfIn PDF document text
    • http://mdc.ir/ckfinder/userfiles/files/22196216762.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/6500512087.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9adbbc96c---bakivupida.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/tbebrpaem3snhurdluerb9i1m6/tagizofep.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968b7956965---mufumol.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/bb1e6193b697718fef18023bd1ecdb8f/62727437457.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607792cd1bebc---tuzipujojezodetuju.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/n3areger1l02ljhh3sph3gve7m/24246172757.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080086554f9b---83365656708.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC6 5148 bytes
SHA-256: 25efc7607a4d1244d5a7e4ae068966377ae879063e608b3be893f7baaf770d19
font_01_sfnt_off0001104d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104D 1964 bytes
SHA-256: 7c4880219e9625d2a4e9dd9baa4d28a857a57833d139bcdeda5c52338edb6e7f
font_02_sfnt_off00011959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11959 14084 bytes
SHA-256: 63eb6720a397672fb51a1409dfea8ceb2c8117c8d6a95a06186bf959ede10b28
font_03_sfnt_off000143e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E3 16980 bytes
SHA-256: 94410094e467795c6a0a1d07e14347de85605568961d93e10bf72c6eb4d3659d

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