Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaab137f4a9d2379…

MALICIOUS

PDF

78.6 KB Created: 2021-09-12 17:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 232965ca1aecaccb975607d082263cbb SHA-1: 5e22721c5fd84764ed35b4a82b27ff3b5fbcd512 SHA-256: eaab137f4a9d237976103728fa6c9686f7ae298bf5b8a1d617958c8a78dae746
96 Risk Score

Malware Insights

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

The PDF file contains a link farm, with numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious content. The ML classifier strongly indicates maliciousness, and the presence of link farm heuristics further supports the attack pattern of redirecting users to potentially harmful sites. No scripts were extracted, limiting the analysis of direct execution capabilities.

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 http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f312ef372f---pudalusukodezidedofu.pdf In PDF document text
    • https://onlinendttraining.net/files/78565774597.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/23391387685.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9d1b44306---11026117259.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/59474577740.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/dinofobijidivusopigipas.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/wipevudu.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/70109404920.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/36577991504.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8c830d3cc---pujedulebudelilakevalowu.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/46629967378.pdfIn PDF document text
    • http://laduses.nl/image/file/92215167079.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/widirikemiwozebamideles.pdfIn PDF document text
    • http://rhondachem.com/d/files/tedukafasumafasujeliw.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/mapeku.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/50796438332.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613093ae92b4f---tiwazizufexebopes.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/81272988328.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/kivova.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/9201853897.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/jumemirolik.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/d2f023447305a74d9ac35098ef063d1e/62734270691.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/69392446957.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/tixilerotijulagikusidamet.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/tolumaruwokafijovemi.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb909dae42---72242773270.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=android+get+all+contacts+with+phone+numbers+examplePDF 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_off0000cb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE370 11372 bytes
SHA-256: 1c42e0190f1cf53d1f43cb0cb02d7eaf2cd2915d9fbd540adf0fe72783c553d6
font_02_sfnt_off0000fda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA8 18472 bytes
SHA-256: cc1dfe4046f6b94e78c8a94eb1cae046b4b9c983b198f93edb5135e84d912aa6