Malicious PDF — malware analysis report

Static analysis result for SHA-256 787eb7083a0dfeb8…

MALICIOUS

PDF

80.4 KB Created: 2021-09-03 15:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e05fbec60629cdc7d1ee8b6b03f1100f SHA-1: 894cfd9110ba56b7a24a7fad45ae681e04d0f022 SHA-256: 787eb7083a0dfeb89eec1443de74776dc7d2752e2b261893ba726386c49b0c34
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised websites or disposable hosting, indicating a phishing or malicious redirection attempt. ClamAV detection and ML classification confirm its malicious nature, likely serving as a lure to a phishing site or a download host for further malware. The document body is unreadable due to encoding issues, but the heuristics strongly suggest a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://solener.info/ckfinder/userfiles/files/35773417470.pdf In PDF document text
    • http://toanthinh.vn/webroot/img/files/kukego.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/xizitu.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160772b3253fd6---84827022385.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/4613f4f810df5587b488699361bb8870/33393185709.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/wonawowame.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/6a1f6c59f3f9cefd26e9ea60cecef18f/wovefanupulenomiw.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/fedomodudodutaxus.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210529093603130.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/95571269688.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-8-26/20210826112457751564.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/p88185o14vr64112819ia26en7/votapironibuv.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/99440286981.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e76ff36d5---sakidogekidisuvikipes.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af4d9a740a---17052559651.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b51543f57efd411eecf46d0c0a709133/20343969722.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/5a337247bc6a1347ee29f510558e5d06/14429286814.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/cbecc4a825ded228ecbfa9deaf4885cd/8107987299.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/29025890756.pdfIn PDF document text
    • http://citra.cl/userfiles/file/woxubokidorebogowupukidis.pdfIn PDF document text
    • http://npas.ru/pic/file/dekugegoxo.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/5771e327ecf71f45e9ba589e0909b609/xemegazodekupuxinanomub.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/36741452515.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=kettlebell+workouts+for+beginners+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_off0000d68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68A 17576 bytes
SHA-256: 505a485484e35abc3fe1afd92b42a2cb03549b61bbc4d66826957710c98b33ee
font_01_sfnt_off00010342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10342 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B59 10920 bytes
SHA-256: b85b00b534fe90af6ae7be6be88edcba4be1ead92fdd26cca742821c49425735

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