Malicious PDF — malware analysis report

Static analysis result for SHA-256 752d0bf8c13700c4…

MALICIOUS

PDF

96.8 KB Created: 2021-07-26 01:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 42137e04d3537bad1f86596eb01b1afd SHA-1: 2c97d148e972a9b1b460f5ca4ba4b542ee61af5c SHA-256: 752d0bf8c13700c4839069bf3eecbfda52031869ed028ab71b8ca78ffdc4ebcf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely serving as a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cc247f41f---nabokeb.pdf In PDF document text
    • https://securityguardsupply.org/php/uploads/file/mugurega.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zijagelunim.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aab640876c6---makirowiromizenolos.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160726504f1f2c---71796047329.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609544b9d855b---mudapivimoma.pdfIn PDF document text
    • https://turismoporsantander.com/aym_image/files/sobobu.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d6f00e8d7d4---80380508814.pdfIn PDF document text
    • http://tradingphrases.com/userfiles/files/46773387252.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/datoxep.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/5efa240c05cdfdb020e9e1f82d95986b/84714457284.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/pepapitikemukaju.pdfIn PDF document text
    • https://primer-spb.ru/files/files/tejusulagitudibupaf.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/f1caa0c0bd45708484ea0a704d0dba11/dufepikesafuj.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/07651b0f7324af018d902d8c0df1a4f1/50804331051.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/cc3a16468e6013ba707e1e8d77b6aa75/bajivuvuxu.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7ef324b0d---58120039468.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/xameweguwiwoburejosu.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/tevafigajos.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/viboneroteronidirotalo.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/25401149977.pdfIn PDF document text
    • http://ridgefieldpark1967.com/clients/3/39/39eebdc8797e30ee23d4fd57d071fd44/File/lajakuxela.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/66505182785.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/e04e93a1ab46249ad141faea649ce82f/37466767378.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e1f3bd4f6---41743714166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+calculate+expiration+date+in+excelPDF 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_off00011527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11527 10616 bytes
SHA-256: 98f8bc7c438935cffc5feed9b8d95f43b0d8c19e4187dd51321e307b0286eec6
font_01_sfnt_off00012d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D85 17784 bytes
SHA-256: 6e4aee802e2f5e96e4d6d0ecdaac1fdef580048703aff010bc3defb0de2a1813
font_02_sfnt_off00015be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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