Malicious PDF — malware analysis report

Static analysis result for SHA-256 5166c63d30d77911…

MALICIOUS

PDF

82.0 KB Created: 2021-08-15 10:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 83cf985a3e0f9b304af01fbeaffd2f71 SHA-1: 31cf47d0d4136808194820dc95d93d25f1b14439 SHA-256: 5166c63d30d77911fd098b0dbd050ad9b53b424ae11db85659ed22e72a408ead
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs pointing to potentially compromised websites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links to WordPress upload directories and disposable domains suggests an attempt to obscure the true origin of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://classtool.info/upload/files/sesapisubajefimevogilosaj.pdf In PDF document text
    • https://fanaf.org/article_ressources/file/mutijuwefazesosumapajor.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/cd1f1bb2bf2271a14e4a41ad5cc61772/gawojofalefijunam.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/1k4tsm0hfqqptbsn59j0v7mr0i/vemadonelejilen.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/kitivibag.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/ximipenuzibiweleta.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/71960ddb5f96525f873ac362cdd3eff1/24919019045.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/repazezisunu.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/454f39a214115b53388dea1ec3ca386b/54282081290.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/cac7d73e09cd3a3b22ae382176d6265b/todekobunoniruruj.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/e88d9cf77fae834e109bde7947d4f972/47742870581.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7489ecfc7---pifosizalutoje.pdfIn PDF document text
    • https://chptravel.ir/data/file/tudulemilizela.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/d770770aa596a40a739ac8a2c2b12279/wazedujiwamepuwena.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3c00d710d---65270116516.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/he6kqo70ep9plkkhe8252kgp90/85774194741.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/ca278994c8146268f1dcad16b3c15a86/20823122590.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/55494ff7322da5b6d4740aa7489f14b7/kowinezikigipekoputuji.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/bs3rpah3b8kbkfld6lso4kglp6/64715056673.pdfIn PDF document text
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/09fbcb3f2bab2bffa5c13f1346ba6a94/luvuziwadowagi.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/zogaxujivudajaxarero.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/guvanudizofabirinita.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/l1g0l3vpi1godacppa5t29b212/1491887119.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160f48f3d7c617---63706719374.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=philips+series+9000+manual+pdfPDF 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_off0000da3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3D 17600 bytes
SHA-256: da8179c2c07373cdbda39c1e3c17bdf480661eef3a6c1d966b472b7533330849
font_01_sfnt_off0001071c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071C 10936 bytes
SHA-256: e3e6c74dab84d62f01335df62a5ce11bc8f2e7289bf3b9c14ce38d645c5d38f5
font_02_sfnt_off00012037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12037 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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