Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a9ed7e2c83ed55…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 02:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d7b84ce8983564c4a6699bdc69e88f5b SHA-1: bb55289dfdaea44b24c09caa6825ab302229eb1a SHA-256: 87a9ed7e2c83ed55b4ecec2d964c75807a2053b12905bddab3a3c89fb1472024
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with several pointing to compromised WordPress upload directories, suggesting a phishing or redirection attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lead users to further malicious content or downloads. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

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 http://phayaotechno.com/UserFiles/File/wodewoxakugubulipusa.pdf In PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/46801310992.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/garogaj.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/69852528202.pdfIn PDF document text
    • http://centromp.it/userfiles/files/xifofafajeref.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/mupul.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/zodevitadupefiti.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/37715365244.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/69965716772.pdfIn PDF document text
    • http://iphysiology.ru/upload/fulaxoxigokiro.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/fosoxudepilepunapugoreg.pdfIn PDF document text
    • http://lagrupacio.cat/file/vaxugerowivazavusu.pdfIn PDF document text
    • http://coffee33.ru/archive/file/87296548037.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/mikujimepezisojazizi.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/kkj86qqotdiof55qfnu6imrkud/59720489680.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/42931011017.pdfIn PDF document text
    • http://yejida.com/userfiles/file/17334890237.pdfIn PDF document text
    • http://topas.lt/userfiles/file/xafudapaxawefafefusut.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/99294864488.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/47134688303.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/663befdd574d7ac1ebb8919f7643f797/76787959178.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/nujifiketesudabupuvobi.pdfIn PDF document text
    • https://cecprint.com/images/file/64719284714.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a5caab718---bisate.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161428f1dc0a5c---sonagarinelonaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=anime+porn+games+androidPDF 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_off0000df58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF58 17436 bytes
SHA-256: 0003f8bc2e4a57c2aa9442660a9fe20a9daa4873e339e7a11fbb9f02b8cea707
font_01_sfnt_off00010c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C53 10572 bytes
SHA-256: af9d26f8e9e48ed7f80a1491d7dd45e23b32a688338f31cc223e3dcc39efb1d4
font_02_sfnt_off0001242f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1