Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f073c5206dc917c…

MALICIOUS

PDF

81.2 KB Created: 2021-08-30 08:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 76a653d2c615fb0779c5a5da4b279ff3 SHA-1: e9ee2e516f2a911b1dc48ab4332e4c702af92860 SHA-256: 8f073c5206dc917c0b4b441d7ad7da682abfa2c59db7414856dc5f1e6cd7daa8
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://xn--90ah6akb9e.xn--p1ai/f/file/devafipigas.pdf In PDF document text
    • http://vanharteyoga.nl/uploads/files/76414316841.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b6cad27b7---pasobatifukug.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/77fquhgilgbdqjrjpuu1ducfop/26872213684.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/7776def67ab7ebee4e01683b9659af32/89991199586.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/radavuxa.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/6743975447.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/pivuwe.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f132cc37d5---3495241766.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/jesatupifipefe.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/619a49a1b74b78034d0ad6c0adc92a08/wezasetu.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/fumadox.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/mijunakebasirixajasap.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160707f6bef377---zalidelimoz.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/3b1b90cb57275a6aa92485fd9912c815/26710332030.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7b04e4e65---15238220912.pdfIn PDF document text
    • http://xsteelstock.com/d/files/navizigamapilitit.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/nosukisuj.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9873ae5639---minamapuja.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021062801440645.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/loralijavokero.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/2d5e47e8f79944350c9ef50dc2322452/gibiturigosoge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=to+be+turned+outPDF 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_off0000d9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E5 9976 bytes
SHA-256: 174bcb4fba11ec6a00575c5026745b8a17142b4bde213dd74a862eda603465f2
font_01_sfnt_off0000f013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF013 18340 bytes
SHA-256: 2511da5b3e3ee6ad2214044502c24f9eaed1ef72caf291fdfedf6a294628430f
font_02_sfnt_off00011fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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