Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a9d6f2412a96877…

MALICIOUS

PDF

83.6 KB Created: 2021-09-11 04:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2b71ecd3e6432bf3715d558a07f233d0 SHA-1: 5a96291182ab3c2730e946263eb5b18c1301cd19 SHA-256: 6a9d6f2412a96877538bc9c1653fbd32f1284efc1d561326eda404f99703c22a
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm and a lure for users to install browser extensions or plugins. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the embedded URLs and the nature of the lures suggest an attempt to deliver a second-stage payload or facilitate credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://milsagliksen.org/upload/ckfinder/files/35236713306.pdf In PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/99762517126.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/mokafukonomaxutuvotaba.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137eea97136e---beleparosugexagiragi.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/vezewegatel.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16139f87396741---zesedemepero.pdfIn PDF document text
    • https://citytrafik.nu/images/file/bolara.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210901110131_5pburj.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/sizogagevuvuti.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/79060489540.pdfIn PDF document text
    • https://btegypt.com/file/14795725154.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/bosimamarizagidomol.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/8289926762.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/zugezudokafepugurovumeni.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/17425682602.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/7170903934.pdfIn PDF document text
    • http://regmac.net/userfiles/files/87194803022.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/98765904177.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/20210763998.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/xujakawiluguwogup.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161323e6c44e95---mosefapimujijutuvo.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/25925189923.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/80010607903.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=add+on+androidPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2E 17296 bytes
SHA-256: 1d3796a7973aa7d4d718e8cc655659f6d0ef753f41fde2cf458f4f4e532cc419
font_02_sfnt_off00012bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD1 9776 bytes
SHA-256: 298a9e6970c24b06079fef247ef67ff82a100433d980a299b7361863a7d2b062

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