Malicious PDF — malware analysis report

Static analysis result for SHA-256 872e66d5b6236034…

MALICIOUS

PDF

88.3 KB Created: 2021-09-17 08:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c83fbd9c68b923ba3a5e6f893ebd735c SHA-1: d0c81b5d12de5a4254b2046066ef0215b50bae73 SHA-256: 872e66d5b623603486a6dfd455d833f8af9891687694184c2e05fcc3d7c841da
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL distribution suggest the document is designed to lure users to external sites, potentially for further exploitation or malicious content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://cooperspick.com/files/82951488727.pdf
    • http://dragonera.cn/admin/userfiles/file/jabisalukobuzokimonizor.pdf
    • http://kemnhapkhau.com/upload/files/85952140776.pdf
    • http://smirna.pl/files/file/sikolidatizavisuxabunuxin.pdf
    • https://ceccardolj.ro/userfiles/file/tivesuwovusitikazes.pdf
    • http://brenderup.ro/mm/file/55519077801.pdf
    • https://euro-m.si/web/dokumenti/file/99383034725.pdf
    • http://marikitaberbagi.com/userfiles/file/dekuleveguxo.pdf
    • https://gulfsupremesa.com/ckfinder/userfiles/files/47438056947.pdf
    • http://linuxnewyork.com/draft/media/29047600716.pdf
    • https://subded.org/userfiles/file/31763698584.pdf
    • http://www.gyndoktors.de/ckfinder/userfiles/files/65113487637.pdf
    • http://pushgroup.lv/userfiles/files/83218723377.pdf
    • http://yesfabric.com/images/upload/File/kumureputararalap.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca90fa5a63---dabokiziramalelidafatorav.pdf
    • http://sp2wronki.pl/fotki/fotki/file/61401310935.pdf
    • http://appartementslisa.it/an3_Uploads/file/diwenidofudaxusebabojiwol.pdf
    • http://espokebar.com/uploads/files/zugewolewomobizepiniza.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b85b9c94082a529aaec7c8b33a90f078/95575538572.pdf
    • http://studioprogettoarchitettura.eu/userfiles/files/52772993596.pdf
    • http://yung-shun.com/userfiles/file/34711835481.pdf
    • http://qdjshg.com/files/file/nejopekuwetodopafexo.pdf
    • https://bishopsalamatkhokhar.org/userfiles/file/relobabetotexetutalumupot.pdf
    • http://upservice.expert/admin/ckfinder/userfiles/files/7210715046.pdf
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73762783252.pdf
    • http://muabannhagiare.net/images/uploads/files/42933924789.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecc87794df---fedelubonumim.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=bloons+td+6+infinite+money+hack
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f25c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF25C 16792 bytes
font_01_sfnt_off00010a6e.bin
0896e9bcabc92c5655d1eafcf36de39286b1b365d9bc9f772b042420666b16fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6E 18256 bytes
font_02_sfnt_off000139d8.bin
4d77ac35ec2dbaf76ac101f89432530c93b046202da2d67cde4f8368335dbd1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139D8 11068 bytes

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