Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d52e607bb64102c…

MALICIOUS

PDF

73.4 KB Created: 2021-09-15 12:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 72642ea66acbdce6d16920ea05cdc4b7 SHA-1: d4517ff678115e4e749244b7db2952ef5b8bc800 SHA-256: 2d52e607bb64102c51f5a1d744a4b70dd18e54e8654fadf2bba7adad628ba14d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. The presence of multiple compromised domains suggests an attempt to distribute malicious links or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c8b1d939b180628d45bc22c31fbeb17e/kotebobikosagi.pdf In PDF document text
    • https://bselink.com/userfiles/file/96484794620.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/27151618576.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad53561426---8398458662.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/wumatisataterapikezuxo.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/saletodoxigekuvera.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/49498107322.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/diwudoroxagepewovuvu.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109092328381801.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/96919668227.pdfIn PDF document text
    • http://electric-kernbichler.at/wonotebenavegajexixirav.pdfIn PDF document text
    • http://rnralpha.cz/res/file/kebitoda.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/popumojakoxifolus.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/xawolarujunakik.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/53269553314.pdfIn PDF document text
    • https://2winit.com/Files/files/fijiwimirir.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/bubolidutojufexiwimexa.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/xefubesonokizumotok.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/domud.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/48668399551.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/69765645536.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/99427510247.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc25b5a883---papisusizig.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/vakibojuxitefomaguduwif.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/xegigubufuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=android+oauth+redirect+uriPDF 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_off0000be35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64C 10336 bytes
SHA-256: 3fbdb9739323e841b415db0470f03c9dd38537d5b3d7978d4e4c84b810bd45df
font_02_sfnt_off0000ed8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8A 16588 bytes
SHA-256: 7ea29be8d170319f8102be7696fd653f2828ec05c362c738d1d9a6aa36b06425