Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8521993047accf9…

MALICIOUS

PDF

85.6 KB Created: 2021-07-02 00:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c13ce2e28aafc6e65f9f488e1ffd7ae2 SHA-1: 3d433f44d8c0eb22b6e8f829969d3b755d6a5704 SHA-256: d8521993047accf955042eaa5ed667ff5fcac26943666f6a2a7275c09ab2fa16
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or phishing pages. The ClamAV detection further confirms its malicious nature, identifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea72cab29c---lewetogapuwo.pdf In PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/73773c59ab26447a28ff5a2bee2e974e/gekawonemu.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/kugepomogolosobow.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16084c32e76b1f---lokibijixixukegiwimina.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/55f6eeaf429e747f1278cb1516d6de6d/44231560952.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/6gtnpgk51g9i5ls4o4oo9mhg93/42111193828.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6f438e5bc---6590789064.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/wasoluguga.pdfIn PDF document text
    • http://1careglobal.com/upload/files/39928701683.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c139b365f2b---fulojanuvin.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/tg8a7lfotfct85i22sges3jul3/gujagasamupameje.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/balupasozelawojixarawemez.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a859b0a08aa---2819677502.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/8dbea706fd98eebd138ad4b1fd945445/18499938609.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/5876666.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/2ca7eb94ebb7d753372aa83ef9e50958/91883431492.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f36d9ff8299c12bf43dd0b35a49ba847/rokaxeraz.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079fe0ab4149---disobizezumubijakixi.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/aa1daa5c62561572963c49230c47a8a9/tuwapizi.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/vudexopukuj.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/bexezijuruvoguxebaref.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/l9g8ngk9fif12epm1lbu4im88t/27285382694.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/98694337119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=simple+inventory+management+excel+templatePDF 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_off0000eb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB99 10908 bytes
SHA-256: 67923ade3cfc8b59a94bc717177728569c4afaaaffb09d564dc4187854e9acd3
font_01_sfnt_off000104dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DD 16968 bytes
SHA-256: 25b9fa30d8cb4dc51b7665720f983aba8466c326b54aeed2b8641411032450df
font_02_sfnt_off000130ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1