Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff9c9bf130bb80b…

MALICIOUS

PDF

80.0 KB Created: 2021-09-13 13:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 756a99d4a102bad4ba3e7b5d629c95f2 SHA-1: 01ad9b2365c0eeb4701d6be5e4e9f7e878f8ab10 SHA-256: 9ff9c9bf130bb80b790a15718b6f746b9e2e5ba8c5deebdd8320f0fc1cad948a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to other PDF files hosted on various domains, many of which appear to be compromised or disposable. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate a link farm designed to distribute malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=1+bhk+house+plan+3d PDF link annotation
    • http://quangphong.vn/uploads/image/files/bujepetipikugoso.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/68879173646.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/91575537590.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/97708862550.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/92241119167.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/kagujegubag.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/32886000828.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/tulezi.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613afea00d72e---desoxelud.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/dafid.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/tawekebisu.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/pefomedotetuludigiko.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/60039878025.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/repunudotamufida.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/74220922763.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/dutozumun.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/40336030976.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/82058764031.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/xivemiroxibigoloju.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/kigoxijujuxerorunologotu.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/nokefilojex.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/9ffa17d0356192fdba81022e34340e39/wizulegoma.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/kamokaxobexakobupoloditi.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/b6321ccdd962d680d6c61021ef92d5fc/pabaru.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132706467a08---96825835934.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_off0000d874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD874 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08B 10660 bytes
SHA-256: e0b97cfdda457f6864e7a5bcfae50245e337e95dec976b88a5ca6849819661b1
font_02_sfnt_off000108b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B3 16428 bytes
SHA-256: 7935041867e7f5f61a1756e22c82476d920bb0283a3f1b77b7dc5eee41d8e17c

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