Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab09d7b1d263615f…

MALICIOUS

PDF

70.3 KB Created: 2021-09-08 20:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 47d9360d5eff4382b691c57aea4933ca SHA-1: ea37fab801ee748e6d5328755d88e5bd76f9709b SHA-256: ab09d7b1d263615f5f35a3d56cbc39cf3d4e67db116befa43ce3dbe652a8098b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://drafthe.ru/uplcv?utm_term=lft+test+report+pdf PDF link annotation
    • http://vtvxm.vn/userfiles/file/67590677676.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/tuvowow.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/58893456433.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/41586514856.pdfIn PDF document text
    • http://baoveantam.org/upload/files/jizexalorew.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16138a09e8e6fe---baparutubafitenuji.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136fcd3024d7---momajexerad.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/7ff9f7b2996b56abd2e75a78c8110eac/xukejavumuji.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/5lhl7pu9r9pou7bn5en7j1jj60/mimugobetizedejexovugu.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/jupit.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/fupoxokewixadosinofit.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/64307729983.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/57942187703.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vobilapilijewozetin.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/wumajebivowafivubanavukes.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/goxokuri.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132734283e3d---54864564933.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210904_2D63369561839092.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/93247819608.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/dotezopolomefej.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/63362897492.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/vidivo.pdfIn PDF document text
    • https://tigapilar.com/upload/files/lemokodoxitizalajugatesew.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/fozefakupolatixag.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/2286078181.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/24264923488.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_off0000b5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5CB 15604 bytes
SHA-256: 82fe185fb52f21d4a8c999c2f168a7ced8cb030d2beb477aa84ce093047896ce
font_01_sfnt_off0000dd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF582 10044 bytes
SHA-256: 6731d958d465d5ecf33f286c790a43f017776b430d4fab758fb1084fa4e106c3

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