Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8a2d9ad99a38a0…

MALICIOUS

PDF

71.1 KB Created: 2021-09-30 17:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3df5a0ffefc8193d54669a28ad8c4f9 SHA-1: 900e15c99c75d257dc0b5ce4b41c2ffc3a3314a5 SHA-256: bd8a2d9ad99a38a0c988c252a3179d7f6efba325f3595c3403adbf281bcf908f
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 designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is used for malicious redirection. No scripts were extracted, and the document body was unreadable, so the primary evidence comes from the URL heuristics and the ML detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garglob.ru/uplcv?utm_term=friends+series+free+online+watch
    • http://nowator-zpu.pl/userfiles/file/wafimelok.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/0ce424f110358d1b05fbfbb17ea2351a/lukewanoge.pdf
    • http://prestopc.it/upload/file/giwutanesiluxixate.pdf
    • http://oldadmin.k12cart.com/media/files/revupuzodude.pdf
    • https://muachungbaohiem.com/uploads/userfiles/file/96919039878.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6606136b1---muxijeludiborituxasudonuv.pdf
    • https://speedwayinfo.hu/uploads/file/jajexima.pdf
    • http://grotech.in/userfiles/file/77817866941.pdf
    • http://open.ua/uploads/ckeditor/files/2138591687.pdf
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/benelebererize.pdf
    • http://agnieszkapawlik.com/userfiles/file/wakeperemafepuregexam.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134da2caf188---16276835060.pdf
    • http://chukgoobok.com/files/fckeditor/file/17625078404.pdf
    • http://rainhouse.kr/data/editor/file/15893171586145cb872352a.pdf
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/pivupesakikejafifekibapex.pdf
    • http://travelspace.pl/userfiles/file/80281119588.pdf
    • http://tid.vn/upload/files/60581949294.pdf
    • https://taiwancy.com/app/webroot/userfiles/files/zorot.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/68260218688.pdf
    • http://floridare.ru/app/webroot/img/uploads/file/521105_kivefutedi.pdf
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/midefudinegiduvapifajak.pdf
    • https://rizecanreklam.com/images/file/sewugomonajuzap.pdf
    • http://innotack.com/userfiles/files/2574321843.pdf
    • https://arbormaster.net/uploads/files/45725448321.pdf
    • 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_off0000b220.bin
b7daf7d0be1b9cfd069b6d4f56f588d5c41beeca0bab6c0e03f1f4e6c9b24927		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB220 17500 bytes
font_01_sfnt_off0000de6c.bin
08ab3d7bcc8c1620b9c103e6b075cc3dd9a0fda0a114457aef8320e0fdfd9e0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6C 10636 bytes
font_02_sfnt_off0000f6bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BD 16792 bytes

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