Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e7ecd7ff286037…

MALICIOUS

PDF

90.9 KB Created: 2021-09-09 00:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: f7c8bed4e577c0686234d84e9f8c0265 SHA-1: 4dbfc6a36b57e7e12da3b94c5d6ef9ea2c624db8 SHA-256: c3e7ecd7ff28603702d00e3e35489fed46ba43b4575566bc7d6e3f92a6a6fd35
104 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://marupyara.com/fotos/userfiles/file/luzen.pdf In PDF document text
    • https://mimpishio2bet.com/contents/files/81604456961.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/devufimukubupovurebuzip.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/68553918945.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/21620677354.pdfIn PDF document text
    • https://ms02bet.com/contents/files/wexazix.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/6acb814a7bb8c7884eee46b4a79c05ee/vanon.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133d5b52b37b---vusaxajidutufeva.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/85245458723.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/zewedinopunoli.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/34010424824.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/49846089367.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/97153193791.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/30152181859.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/16369216349.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135c8d9a3f4c---60502833102.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/68457089973.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/jeferipopupotedo.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/genavilazijawu.pdfIn PDF document text
    • https://manenshop.com/upload/files/42463733724.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/55440322064.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613100ae001d6---bokidudaxitowekekezas.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210901224332.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=doga+comics+pdf+downloadPDF 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_off0000f5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC3 21360 bytes
SHA-256: e06b930035efebef99eff64a851dd57ecdaacc609ce94ea21f2960066e5f03f5
font_02_sfnt_off000145ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145CA 10720 bytes
SHA-256: 74de407df039373a229a4d995d2157fc19acae99968c879b7166126b7aada406