Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b65341d27e2f853…

MALICIOUS

PDF

82.7 KB Created: 2021-09-13 15:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fd20a5f9c34026cd306daade1629cb2a SHA-1: fa2d615a19c9070cde8946363e0c90a9b12ac9e8 SHA-256: 2b65341d27e2f853a319dfcbbf6e9f4e9cf7472fd0404eddb6a58d60bc587c87
144 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and presents itself as a link farm for software downloads, with a specific lure for remote-support tools. This suggests an attempt to trick the user into downloading and executing potentially malicious remote access software. The ML classifier strongly indicates maliciousness, and the presence of multiple links to disposable hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://olympicburger1988.com/uploads/files/dogupe.pdf In PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b429182cfc---tozigevol.pdfIn PDF document text
    • http://nsaimmigration.com/userfiles/file/namesizazikotapusosilul.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/tasobozonapixilu.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132e2c4282b7---67638081482.pdfIn PDF document text
    • http://foxhill101.com/userimages/liwugusuzivi.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/59424914268.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/pejiwififegijuza.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/31943163488.pdfIn PDF document text
    • http://sakem.org/userfiles/files/62483049856.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/folodosedasiwafenarevede.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/52357558685.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/50886731787.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/5659255787.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210913062454287.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/tazulopigaxodujakipuj.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347c6f36643.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/80778976258.pdfIn PDF document text
    • http://portableandcool.com/files/files/fizetolo.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/13518252273.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/jezegafagugalifegozarew.pdfIn PDF document text
    • http://beiks.info/public/file/84844232011.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/49783581130.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/vulonine.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/23625728033.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/dugefuxuvixolet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=movie+downloader+software+for+android+mobilePDF 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_off0000de59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF670 10800 bytes
SHA-256: d58787b59641f019beedf90ad416496c5f8365df3c88cac17b561d0613fb3ebb
font_02_sfnt_off00010f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F62 17468 bytes
SHA-256: 73d10d54588d67ba6d9932105abae2e8ffc69c9de4368d011fb502f8976a8e46

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