Malicious PDF — malware analysis report

Static analysis result for SHA-256 e18b0b209c8046ee…

MALICIOUS

PDF

166.5 KB Created: 2021-08-01 16:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3c1f300214e552bc41d4aa76dd96421b SHA-1: f8bbbfd212169ef4eaedac8d9cfbbb29ca88881b SHA-256: e18b0b209c8046ee5c65c80912b504eedfffdd80405535855790f7261d43fa2e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the heuristic findings clearly point to a malicious link aggregation strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://huntic.ru/uplcv?utm_term=what+are+harmful+effects+of+bacteria PDF link annotation
    • https://autonoleggioassereto.com/file/rijixipebufowatojob.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a50ee786c69---gapubusifonevuzo.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/xapewaxuwekipenuwagi.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/21519273321.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607359a06a0c9---rukigub.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a6e8eb427---munenetif.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7ed280b63---wanutujosuzazefalupa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca4a618efc---xosiras.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/4pdm0miei5q6l8qpnc7lvue76r/65644149263.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/93857376030.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/fmkp89k75e903t00lqhu04k5o1/35403516299.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/dae9f2f08aebad8eca9a1d1fb8391ca6/femiweluwujepatobepod.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/a9c0a667ab3d6108f0db7d363d78e928/55062890003.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf900cc62d9---nulugelabev.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/76963945908.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608737e33ac91---visabizedi.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/79085365074.pdfIn PDF document text
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/82422501259.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb29ae5d64---defef.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16085295cce352---subosej.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/fuzowuxopexet.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/bobiz.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/78777302800.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/44094943718.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_off000225ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x225CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00023ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23DDC 21344 bytes
SHA-256: aae8d0c2a92c17ed01abc13e9e2a8fc2a7dc6680cdeb14d4e2fe4074abd6dcbc
font_02_sfnt_off000272d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x272D6 10728 bytes
SHA-256: d64b8a99c66b11a8d3d54e7737793160ccd019980eb13ee54a4e8dd6d8646871

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