Malicious PDF — malware analysis report

Static analysis result for SHA-256 c87887cea852c5d8…

MALICIOUS

PDF

91.2 KB Created: 2021-08-24 18:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 558549940cc75b8e4f9e4a02608d0d13 SHA-1: d76ce14f0910ce4037793799356ca237fc97ea09 SHA-256: c87887cea852c5d8f5e490723e6553a722df2d681ff9f22a1420e3eecdd95e8e
196 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a security-bypass lure. 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 0.9932

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://catamma.ru/uplcv?utm_term=electronics+engineering+interview+questions+and+answers+pdf PDF link annotation
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091c289a8791---63010731706.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/6639196020.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/simatixurajopogotixeni.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/26347013298.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/jobebamadasadigewomisoj.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bde1e2f372---54461825613.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/9a014083276ad8b70d2482bf5cb9182b/43581540414.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/91496166132.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e1ddd9e5d---domujuruseloni.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/vuwugositopu.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/36382999066.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/goganudalu.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/dejotosobam.pdfIn PDF document text
    • http://dzbnf.com/upload/file///25477906456.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/teganitun.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/77842991732.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fb21233ba44---69640344517.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/12535470553.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607717c3dd353---zedidevobisafesusitikov.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/2fb659c5f53775345b452c30336a1b00/75380060806.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8638578afa---83043125143.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/d72c96223b42cec3067977d0db455626/nibawekituvakuvozeso.pdfIn PDF document text
    • http://oodow.cn/upload/file/2107301932378636384gbfw3n2x4cd.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1610b72e0da6c9---devuvosusorasituvi.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/8377711275.pdfIn PDF document text
    • http://findusafranchise.com/files/files/20287793033.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_off0000fd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2D 18092 bytes
SHA-256: 4f63df0ac5d0c13c8e33efe2cdcc20dabb76721dc6a6429a99dd34eb6855d2bc
font_01_sfnt_off00012ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA7 11176 bytes
SHA-256: 6ccb58912e162f8af82a638117f10db1ec3e80492b9f7194826851fd52195f1b
font_02_sfnt_off00014576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14576 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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