Malicious PDF — malware analysis report

Static analysis result for SHA-256 8953325b93cf7ec7…

MALICIOUS

PDF

97.7 KB Created: 2021-07-19 12:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d1a13140fa3eb89ec6ad643a016c2af3 SHA-1: 045a9c494b0d6aa7a06271ed5f75fd6464d7f32e SHA-256: 8953325b93cf7ec708895e20e00da41d38a823b0de00b1edc00c93ababe5b84e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. These links likely serve as a link farm to redirect users to malicious or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e095c2651cd---zaxusowemidudavemawe.pdf In PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609070aaad948---wigilebofiruwurunidadimu.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbd1f4e178---gajawaweruzusoxerowej.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/14289108648.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/08f7e887f071601223bceb382ad3f1ba/76150544494.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/duwelevapivuva.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210505124502.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/95esg55s7ge2n581c4gsltkef1/neluzopedazolapot.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/0fin92193dqvoq61d71sgis61s/jutene.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/94370455506.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210514083641.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c8d3a0dba---67659817418.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/ce31570ce620222c194667feac14c921/95099931606.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/59974011865.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/ik6cgb1c0ocmojqenv5t06q2pl/22115821234.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/sirenubel.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/41223885951.pdfIn PDF document text
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/sotogorubone.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/digavuxamumitamafisizemew.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210612073258297.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/049c70adaa81122e2a619b037ecf0bf9/88407132606.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/49396784815.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=nice+words+beginning+with+hPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0E 17028 bytes
SHA-256: bcff86f9488d2e9d54b2aab79b280504f61241288740f81652506501bc50669b
font_01_sfnt_off00014972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14972 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16189 10644 bytes
SHA-256: 8f70e460cc2c17861cf21588648f1e2d2b338bc8f34e2ef5f1142e357258f0ba

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