Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f25499bf6f1b44a…

MALICIOUS

PDF

85.4 KB Created: 2021-07-05 11:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f81f0727148e7e48c1bd792c43115e67 SHA-1: 8b63893cc6a7d32294aaa835d43fb9c33dc4d4e8 SHA-256: 6f25499bf6f1b44acfed63234282765dc7bfc676859b65951978c1a1cabef071
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external websites, many hosted on compromised WordPress installations or disposable domains. The embedded URLs suggest a lure for phishing or malware downloads, potentially exploiting vulnerabilities in PDF viewers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://inwebjor.ru/uplcv?utm_term=ppsspp+wwe+2k20+game+download PDF link annotation
    • http://fipjp.com/userfiles/file/24536887633.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3873a837b6---tejosunog.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/ferodiwedagalubitob.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/40bfb356345c634cfaf2e886c8cdf777/25455935788.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607917675fb86---9133200443.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077d32f1e59c---45595930434.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/tunopepokugexusirolugine.pdfIn PDF document text
    • http://macphersonproperties.com/clients/876251/File/70391442750.pdfIn PDF document text
    • https://506hlapeta.com/files/file/vijosolomuwelap.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/f18afd156a4ce95937cdb93bbd7eb029/34613073057.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/c798aed3e8395c0c4edf5f4f9e61b67a/mosikisotol.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f55494e66---pisok.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/bfa2b4c805325c461d6e8d8708f0a0d6/82763980924.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210524/file/kudusevewibukebat.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021517170455251.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d1b7ea526---68745386073.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce6102505e8---81979040526.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/e817ea0821f308d0a31ae75221de1f38/16740058938.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/napogawonogapuk.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/f2e66e519e62f1869b1ce06fa85d5e4b/81826028529.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b40c84ae40---pevevuforezudejojasiwam.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fakomodimepuxiros.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/8370ca526c08893e5e7f245a7f5a3c9b/lulobeki.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/serew.pdfIn PDF document text
    • 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_off0000eab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB7 17092 bytes
SHA-256: 6033790fca15d502ec212893dad944cf7f4d08cd38b4fc136b69fda5adf730ff
font_01_sfnt_off00011764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11764 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7B 10864 bytes
SHA-256: e177dc28d28478090e1be3e692afbfe49735718517b88ea9ee34aab3e3ba8fe6