Malicious PDF — malware analysis report

Static analysis result for SHA-256 21cb2088ce8441c1…

MALICIOUS

PDF

73.2 KB Created: 2021-09-10 22:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 37e6fe51d1f831ad2361217462f89239 SHA-1: 5d6d5107a0a525b81ecb33f37e2652f203d3c88d SHA-256: 21cb2088ce8441c1d81a306a3f77b20897bfe6112d60fde6d60ab7ce7f391e79
212 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a 'download button' lure and explicit password instructions for an archive further supports a malicious intent to trick the user into downloading a payload. ClamAV detection confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=assassin%27s+creed+bloodlines+game+download+for+android PDF link annotation
    • http://nessie-vinylcare.com/file/lebevezosarazuja.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/21613584104.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/1954313075.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/161316a390393e---turijatuwenemuwi.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/91976067383.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/dilikozafo.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/32969713711.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/49296031497.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/19799295989.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161349cd87942d---59748611832.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210903/file/16306427313898.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/merasiguzimew.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/majopotinenawaxusad.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/46815321929.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/kafuponorefipuzojer.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/37736584428.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/vofimol.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/56700290954.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bcb8ac1d1---kuxekufexutemufubuxo.pdfIn PDF document text
    • http://xenangheli.vn/public/files/vewanifi.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/daziw.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368c4b79630---remikodotitixedawesi.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/niwokipuganenaruv.pdfIn PDF document text
    • http://agro-partner.com/Image/files/geburosotizof.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_off0000b66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB66E 18576 bytes
SHA-256: b8ca6b40be5d3fedbb33af26f1d7f111245df28f05031c4448b2eee00b8078e6
font_01_sfnt_off0000e5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A0 10960 bytes
SHA-256: 12ff19f344f6c4b2424edb9a6b7351b9b1a8561ac1d72aa48643957324709746
font_02_sfnt_off0000fee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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