Malicious PDF — malware analysis report

Static analysis result for SHA-256 9feeddc3b8a81263…

MALICIOUS

PDF

99.3 KB Created: 2021-07-25 02:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 674ea17684533f6564e6c725e84fb067 SHA-1: bddc34d576a61b232ce16b890eaf5e81407d8026 SHA-256: 9feeddc3b8a8126392791b283905cd2ebd690157ea094b507186a91f47e91965
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. Heuristics indicate it contains a link farm pointing to compromised WordPress upload storage and disposable hosting, with URLs containing SEO-related terms like 'download latest bios'. This suggests the document is designed to trick users into visiting malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb80474469---5827524650.pdf In PDF document text
    • https://tecnibat.net/uploads/archivos/tevidofokami.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160851f3d931ac---84974884634.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/25859073678.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/jawawenoxefuxixovumepu.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa78df7c3ba---waberatiketob.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/vesivipugin.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/vadiduwojuvalebixanitukok.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/31bdc487087c54f1698b2886572fa294/28680185587.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/42510272572.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/rolajuxovibarukeri.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/bapivija.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728a5d3e1c0---pigafalejexoxuzelim.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0764b69ec6---22986314262.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/wojevamimetizokutuj.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608174b46c78e---52011991881.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b00b1851149---dofogowiwufefowak.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-1/20210501175234953086.pdfIn PDF document text
    • https://bioesteticaonline.it/file/78869729998.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/nifukixo.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/79670035803.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/3bbedb3eb34ed9fe301fdda913fca982/40763002379.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/kaxulemapubinisedusukibo.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/newuwazudojorox.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/naxejedefenipitoxiki.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/vuramubafajimini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=download+latest+bios+for+msi+motherboardPDF 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_off00011a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A79 18616 bytes
SHA-256: c3a95bb76607f8a639cf261821c0a8c17535a071e07e5ba4f849d3295208970d
font_01_sfnt_off00014b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B93 10848 bytes
SHA-256: 2e9cd59141e408e47b9ddebad433c4acfbd83d474d39afa429cdf6c3b02b063e
font_02_sfnt_off00016476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16476 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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