Malicious PDF — malware analysis report

Static analysis result for SHA-256 11edd350b9faac9b…

MALICIOUS

PDF

87.3 KB Created: 2021-09-01 21:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: d6103e485bda01cad2f42dc52f9ef461 SHA-1: 7b5a252566353198f26268d51a6c28dcf19c7b37 SHA-256: 11edd350b9faac9b3ffbd341ce60a408047e86ebbd7b951ca4e373a4d0063715
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 0.9990

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://laborke.ru/uplcv?utm_term=three+isotopes+of+oxygen PDF link annotation
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/2825245f1911810bc52b23932cf71e0d/gibovigakofif.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/remisixuduz.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/eda050666478f4133903ac289f485035/21734122938.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16107bed40d33b---62641865367.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/55876718870.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/f288341032417f35c26d9222e97aebec/33979887079.pdfIn PDF document text
    • https://airtelco.com/data/users/_/email/files/sekimafopisax.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/79192747102.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/6219098158.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/55797310135.pdfIn PDF document text
    • http://fvhs1970.com/clients/876770/File/75030607488.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fdf2a5b4d---63289572287.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/65317601432.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078c6076b9b8---5655372028.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/karefoxukibuvoxeledu.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/77437234441.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/59206066867.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210611_C07703E7832A6A51.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/drtokujhdk0ndscit88mlmf359/73612192770.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096880cef05c---ruwofelifavij.pdfIn PDF document text
    • http://exantusfamilyreunion.com/clients/9/96/968554593547eb574606130639276270/File/87095208901.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/30917667749.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/860923f7722e6142fcbab1c977f96301/82710630590.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/a5328reb5avqibdso7btvmonp5/24135665031.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_off0000ef12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF12 18612 bytes
SHA-256: ec7c2fbaae4ce5a537b65f9a2c10d396bd11671a50fcfa3d1c799b253868399f
font_01_sfnt_off00011ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF9 10608 bytes
SHA-256: f71f557cffb0b395ab4bd62f5ed3355b63d74c65d5a71d6901ae912b38f909eb
font_02_sfnt_off0001373d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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