Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a9fc6037dab9e0…

MALICIOUS

PDF

83.1 KB Created: 2021-08-19 01:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 266596a62a3dc0ae02b5ade925092e83 SHA-1: dfdf49a5b0d9a60b2a5bb157d3bace4d72704f8b SHA-256: 11a9fc6037dab9e04246bc124cd386637069d5f63bcdf381a1f26933fcdec464
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/qg1u4ujs7k3k14ge0v3biskap0/44077861993.pdf In PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210815221820.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b38d788139---27724290573.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160867dbe9a226---75075578912.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/94249595861.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902fc15f5cd---83558751055.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bb3090e5e---96979145397.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/58472030769.pdfIn PDF document text
    • https://petikdaun.com/contents//files/23615703723.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/r9eskf254snir7ue0mnbnafvk7/83556899811.pdfIn PDF document text
    • http://sb-78.ru/files/file/tojorizamulatedomisuzatu.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/zixodewaruvasupebase.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b87418c19c0---40985053338.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/mojamelosewetitawotif.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/0b0d695b83e6a61411155af7105878dc/53456650411.pdfIn PDF document text
    • http://firegallery.ru/img/upload/1534722742.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f75bd240a4---2797507736.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/10772839453.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55518138914.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607823c9b7d5a---bowobivijoleni.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/51997725505.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/42317891560.pdfIn PDF document text
    • https://melz-feu.ru/upload/sofodopaz.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aecff23f7e---85229304364.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/6kplrt3dabcn2k7u2qk0o13rga/99955878353.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=9.s%C4%B1n%C4%B1f+resimde+%C3%A7izgi+%C3%A7al%C4%B1%C5%9Fmalar%C4%B1+kolayPDF 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_off0000deaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAA 18044 bytes
SHA-256: 1f5dbfbdbd96ac9d7cf575730a6965bd4b7f381c99be0fabe73e5224195dc927
font_01_sfnt_off0001099b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B2 11488 bytes
SHA-256: 515dc919de475de848d9abdae2da5a4e6bcdf6d1a0bf1ba21169b0c3266d78f2

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