Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ae4ae6e171bf5f…

MALICIOUS

PDF

84.4 KB Created: 2021-08-15 00:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 81e41ab42680f6fa8dc0aed21c285ff0 SHA-1: ee3ad3cec12e19d8ed929ac7ad73a6e5e7c30c14 SHA-256: b6ae4ae6e171bf5fde3c61d0bb93a6070389f4d3b472edc36c2aaf59be027dd7
96 Risk Score

Malware Insights

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

The ML classifier and heuristics indicate this PDF is malicious, likely functioning as a link farm. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is unreadable, but the presence of many external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 5

  • 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://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/6ptjqt9jahu9bjtvlqr1fu66s8/jujebijode.pdf In PDF document text
    • https://progin.ch/ckfinder/userfiles/files/81251348813.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/44923422815.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6184630105---50046113681.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68ee2f2567---vuruxuwitadudepar.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/jesununalixarepe.pdfIn PDF document text
    • https://raljob.com/userfiles/file/setifawuwoda.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160719475dcabf---92706668316.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/29323779424.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/sulekusaxogudulijuzeni.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/jijimufol.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/d54de105c5d505f18f866a5c67ca621b/29674568924.pdfIn PDF document text
    • http://hidra.it/ckfinder/userfiles/files/10953066817.pdfIn PDF document text
    • https://anfauglir.com/images/file/jobegogesilen.pdfIn PDF document text
    • http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/vaxejawuzoluvekajuvuzet.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609840fd349c0---banosabuwimejagidamuzad.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/us7sbavf7ap3i11vgdnc5ud8c2/xurepufu.pdfIn PDF document text
    • https://ever-progress.com/upload/files/nitepizigisu.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da1c1036c03---88701160968.pdfIn PDF document text
    • http://ruegen-ferienhaus-schneider.de/userfiles/file/96781030070.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090316389b28---buzamupebiwemisaxilifik.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/wijotixojen.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/zelawotijanilamo.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/34079667871.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e8e8d1b03c---40145229763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=delaware+wildlife+area+hunting+mapPDF 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_off0000e526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE526 16996 bytes
SHA-256: 35973e502bac29cfa53f3d6ca78fec62903f710d25d1dd635c292c749e01c8e4
font_01_sfnt_off00011193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11193 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AA 10844 bytes
SHA-256: b45c4b8c8c7df86307acef363ffcb0bd2bec5cf97db93512268de543a106b602