Malicious PDF — malware analysis report

Static analysis result for SHA-256 a084ad7950766202…

MALICIOUS

PDF

85.2 KB Created: 2021-07-30 17:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 99c281a71c2ddabb297ad8aba83621d0 SHA-1: e3334f5c3faea95358761d25a462461b7b47d0fd SHA-256: a084ad79507662022d74f5a66c85718da61a2a14d03154aa96696b0ea3c90e75
96 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier and contains numerous links, many pointing to compromised WordPress upload directories. These links are structured as a link farm, suggesting an attempt to direct users to potentially malicious content or phishing sites. No scripts were extracted, and the document body was unreadable, but the heuristic firings strongly indicate a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b89ce351d1c---bosujonajepomewonafukava.pdf In PDF document text
    • http://sjar-tech.com/uploadfile/file///2021062104545321.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092a25decaec---zepita.pdfIn PDF document text
    • http://nfc.soo.jp/file/pefofisegageg.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/banixadufelalujakebeg.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607037dc64f50---91696486814.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d9ebd0d46---51095660181.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/tepuba.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075853f47bd2---7182950478.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/tunilikuvipekuzuk.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/xekisipuratabas.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/88586155006.pdfIn PDF document text
    • http://hodori247.com/uploads/files/fovuxagotapekitapakoj.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/mojimikobom.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/c21f27bcb824ead66c69c0347046c509/76732346257.pdfIn PDF document text
    • http://nktrading.qa/file/files/73956843564.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/tidiruzoligi.pdfIn PDF document text
    • https://pasarangroup1.com/contents//files/sogudagezaxexepoziwagu.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/96076786193.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/gapuvegajatido.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9edb71e04---jupizifo.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/9979354885.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/as38tqrbvgn02vmqgrr6to9hhi/23034363187.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/29c0a1762acfc0409580534ed14843b1/wurujefo.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/77579149603.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=assassin%27s+creed+odyssey+die+tiefen+der+schmiede+verschlossene+t%C3%BCrPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4ad26de8fb---luluzupepexoxedapufadita.pdfIn PDF document text
    • 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_off0000e3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BB 11128 bytes
SHA-256: 64bf3c9e10f1b59316a01c0a9e1de7cbd45c9814a4fb74d0baaa86e65c8df78c
font_01_sfnt_off0000fd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD88 18224 bytes
SHA-256: 0a52ac0de1a975ac62f673926c665cba7aee0f02ec6b44b5a396c1fb4b1cba9d
font_02_sfnt_off00012c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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