Malicious PDF — malware analysis report

Static analysis result for SHA-256 abb3f0693f7866d2…

MALICIOUS

PDF

102.6 KB Created: 2021-06-26 23:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c7b0acf08c9cbe502807d0e7f29b76db SHA-1: b3ba1f4c403ce2614c2a549331cff53668df3992 SHA-256: abb3f0693f7866d24527275e7e2e94792177fa30fdf82a2a8fa76e5c322abb28
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. The presence of multiple external URIs and a high ML score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da32f46248---49825681469.pdf In PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/c98e769ebea6f7ca89c807d56b864c8e/rojesebe.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/91692446177.pdfIn PDF document text
    • http://immopolignano.lu/images/26985896586.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/706f26b578f328cea9d0c76c51de70d3/43196892519.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/nitezejinaritodafa.pdfIn PDF document text
    • http://akssert.com/userfiles/files/67756010466.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/varilomivi.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/a3ac13d6f2d0153a4de988909681688a/14851029203.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ff549c92---xavisizulagorozurixa.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160847259b175a---55132545140.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9b4eb4fb7---16573160851.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/503653d35001e22f4fedfe1ce0702863/19660685609.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/582517562cf556e1e5a5ce8b8706ba1a/zuxijavofevi.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ea622d950---40289923288.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fc36a8618---62022810467.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609920a03ccc7---42335846092.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210430210325188.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57b6717f3e---7337262387.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087ffcc5a527---dapupul.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/48d4f291655ade1d61d388ca8f00f056/10690742812.pdfIn PDF document text
    • http://sparkpro.lv/content/file/6815990253.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeae8a71a2---92371739696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=annabelle+the+real+onePDF 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_off00013217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13217 17168 bytes
SHA-256: e384bf6f08a5e55b02dd95acf1ea2a02faf1b153222a371da899bee8bcfc5c42
font_01_sfnt_off00015edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EDB 10068 bytes
SHA-256: 1bced8ba87eb9aeda26003484758614b2b66bda160911aca01661da8b2b1f0c3
font_02_sfnt_off0001753f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1753F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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