Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e61dde0b36b7ec8…

MALICIOUS

PDF

69.1 KB Created: 2021-09-21 02:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8cc96ad33ee8e703b08a5157d6bec2b0 SHA-1: dca2fe98b4dde512b1a65a386244f4475e5df20e SHA-256: 9e61dde0b36b7ec8153a1971779caa4b1e95c0218a7ccb677ec96faffa9399fb
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that function as a link farm, pointing to various domains. Several heuristics indicate that these links are associated with compromised CMS uploads and disposable hosting, suggesting a tactic to distribute or obscure malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=words+start+with+k
    • http://old.smartplus.pl/ckfinder/userfiles/files/97190953522.pdf
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210913161314.pdf
    • http://olgapolyakova.de/files/files/voroliwulufovevubex.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613037c7ac5a9---rurox.pdf
    • https://labelmarket.eu/data/file/wuwimuguvavudukezilixe.pdf
    • http://trungtamdaykem.vn/Images_upload/files/90652940186.pdf
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/tuxapawukawazoge.pdf
    • http://sarica.com.tr/ckfinder/userfiles/files/gunapunazigif.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161454b95e4ba9---jedifojegadu.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301267c299b---regoruv.pdf
    • https://receptabc.hu/images_banner/files/97682791359.pdf
    • https://ripedzn.com/app/webroot/files/fckeditor/file/puseliwimeso.pdf
    • https://youkuvpn.com/upload/files/99851730176.pdf
    • http://kabaretyimpresariat.pl/Upload/file/benolijezijesij.pdf
    • https://korvioinfotech.com/ckfinder/userfiles/files/28024394270.pdf
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xodovabuwebidewow.pdf
    • http://farmaciacogliate.it/userfiles/files/gibegitokopeg.pdf
    • http://mini-garden.ru/userfiles/file/57956491405.pdf
    • http://emeraldcovepartners.com/_data/images/file/45546689930.pdf
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/33522288662.pdf
    • https://chulintemple.org/CKEdit/upload/files/83866802796.pdf
    • http://metallpress.info/files/65478772014.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/07htb93fjd0po35iorbv6qt1at/ziwitisoratimixazidevala.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_off0000afda.bin
8d090be541dbc46c6dc317c5be1b6ceec151c46500b9edb3faa01fcbf81f2358		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDA 15876 bytes
font_01_sfnt_off0000d82d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD82D 16792 bytes
font_02_sfnt_off0000f044.bin
cd4628b3dd4c5014bb9aeafa74afa896bfd13e9a43d0b076ca8d6364abf495d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF044 10232 bytes

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