Malicious PDF — malware analysis report

Static analysis result for SHA-256 990a3f9ab85aa432…

MALICIOUS

PDF

77.1 KB Created: 2021-09-17 04:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 67140f03555668310b751c5ca5129e8e SHA-1: 9ee78b362f6b8a9f2b6326aae2ba3543ab16df40 SHA-256: 990a3f9ab85aa432060598a4abd901dc3e60a91a810b3e1dff280229d1ce1e93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://smidgel.ru/uplcv?utm_term=fancy+numbers+copy+paste PDF link annotation
    • http://ohana1bbq.com/uploads/files/96837434783.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134b0fc03d10---96673795697.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/zupaximusunidekure.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137fd90459dc---bajaj.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/bexexekewuxa.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/vnmuekj8qda324gciri9nbt6l2/29505897559.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/regepakuzobupufugiti.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/89d4f2adb55a5415cccb639d928acb9a/61716604785.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/74924587816.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/toxaxovesekapipevobesulo.pdfIn PDF document text
    • https://intersat.lv/files/file/melesemobuvinulujukirixig.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/885adb5dfa2e9087982a4d40ed15beb4/xogakuwozowomadajit.pdfIn PDF document text
    • http://vinmexindia.com/uploads/dekatutidivaluwumonuxel.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/giwiduzuzakekeduwixetuja.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/91756076548.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161346a3a7f8e3---dijokunaberudisal.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/168878794613f738d5dccb.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/64570458883.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/jerisef.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abea6efc76---jivoworufekite.pdfIn PDF document text
    • http://ccadl.com/files/20210914054159.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/70288181895.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/18694127381.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_off0000be19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD630 10728 bytes
SHA-256: ee91289e2a9efbb9fd2947629e6a7f9fa63f2491df5a74c2db09c23767fbec89
font_02_sfnt_off0000eeae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAE 21912 bytes
SHA-256: f8b97a376d3a19ee9c15cb74eae0ca49d984dce1905b184a1a3c7bc5fccb9179

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