Malicious PDF — malware analysis report

Static analysis result for SHA-256 30a68f36387e2525…

MALICIOUS

PDF

87.8 KB Created: 2021-09-02 00:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: da3971e7ecdf6235b20a4650995338db SHA-1: 47d3e03e876dfb1f268866ee9ec2b222c12a9c85 SHA-256: 30a68f36387e2525c5c813e1c2c976293ba89a5a1a01892c85f82e2a4198b5c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae37697022---buvekumobofugekenu.pdf In PDF document text
    • http://nsk-nalogov.net/upload/files/93709195299.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/foneju.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/98dd796a0ac6d4eae375dcb14b9a1813/guvubanutujona.pdfIn PDF document text
    • http://debden.org/userfiles/file/zufejiba.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160a96164911c3---xobosaxaxag.pdfIn PDF document text
    • http://lex.tj/img/file/58914925075.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/vovoxajirafol.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/81j5vncqn5rcg3hsnvmbatkvpo/novunuzexateverejibufon.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/sumazubegopuvirelubesano.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/berunuriwexurerovowo.pdfIn PDF document text
    • http://pensacolahigh1964.com/clients/1/1d/1d652d7f5bd5fd2f3712913460b20393/File/30928287160.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/tawuzegademovatuzosogura.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/poruzezirenopavovadenor.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021625550484959.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/611259b926fef.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/dupewupiruxagewe.pdfIn PDF document text
    • http://kmsenior.org/file/files/62753423969.pdfIn PDF document text
    • http://d4squebec.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/20305294584.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903a3245784---45355715696.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/41628130869.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=hearts+of+iron+3+strategy+guide+pdfPDF 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_off0000ef3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3A 11004 bytes
SHA-256: 62a63c3aef5f9d56af95dde71e12d6a1c4a055d72f150ed6ac53a8addec715a2
font_01_sfnt_off000108bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BD 18820 bytes
SHA-256: a9a7e27b8f40dae320dad7bec831c6362bdfc36cbcbaabb2219ef224bce40921
font_02_sfnt_off0001399d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1399D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1