Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ed7b78394213d9…

MALICIOUS

PDF

80.4 KB Created: 2021-08-06 00:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e7b6cc3fb4c6034178b1e526d39d904d SHA-1: f5fc9f43d461535de902908081bc2a89d9331887 SHA-256: 81ed7b78394213d92e7c1f6ea96893bf6316b09a5e6b85f8bf51f5ae6481a87b
124 Risk Score

Malware Insights

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

The PDF file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, directing users to multiple external websites hosted on potentially compromised or disposable domains. These links are likely intended to facilitate phishing attacks or distribute further malware.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3497

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://areaengineeringsrl.eu/userfiles/files/buvawevokitozoxiba.pdf In PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/52f6ceb1e33082f34c627947a7f188a9/netuniji.pdfIn PDF document text
    • https://gilbertems.com/videos/file/27755871046.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/duluwof.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/benaf.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160869f0dd5700---8590634278.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609c09f9146ee---raxudufesijebezivizu.pdfIn PDF document text
    • https://vientangluc.com/upload/files/nigivatunujusuluk.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/133d33cef39d104208710cc8dd50fad8/98551842899.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/52f9acbc49dff449dc9e218bf2b6b752/nezawu.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27e8ae2c16---34851461329.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/14c9c6dfad297baf7689b1de5e1f0a4d/doxokukuxevixik.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/oufij21m9g47aluv4p6tu5gqk3/wefiwomojatoluvav.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/nijiwiselomuraxi.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/soladetidopirofex.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc00597e06d---50197760373.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/debarevedalikituvolegu.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/miwidanagorafuwajafabenis.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/mixibedo.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094ce27e1920---vexivekatuzafopaxurix.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/3a5e33363674e015b75181ccd1335d47/muwomowogojaxomopiluxuka.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/68613879350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=lasers+and+feelings+rpg+pdfPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/kujoduvobobesukaturit.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEE 17744 bytes
SHA-256: 8a6da146c2a86879ca508ae92384b6e1c6cdf936cffc8956733e51b22caef42a
font_01_sfnt_off00011d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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