Malicious PDF — malware analysis report

Static analysis result for SHA-256 be9db71d720cb2ef…

MALICIOUS

PDF

71.1 KB Created: 2021-09-09 01:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: def0a11724f5ed6409862e924f283edf SHA-1: 12334fcbf2f3d9bc5be779021f2c4013421964b4 SHA-256: be9db71d720cb2ef9a43393f9b2a1b0db7483c4456b0f0b8200e81d59c5c1ad2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137f63b6eb4f---17695881220.pdf In PDF document text
    • http://abaj.cz/UserFiles/File/womokejasabujovovovapat.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/573218486.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/83237635645.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109090636313645.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/93274677096.pdfIn PDF document text
    • http://373113.linker.tw/files/kakovuratuxusadalelajam.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///nogamaviwenefe.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/rijadusibege.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/76114903450.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ab02e2b56155e9cc99fe75d86a36859b/3652333735.pdfIn PDF document text
    • http://teakdeck.pl/files/file/lexeremesutufepumeras.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138b6a6349fa---94375072684.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/xofunamudoze.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161361bc0d7b2d---wepajaxokivomerofasado.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/movuxonejurivasudid.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/luzufoditafe.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/kejumisofo.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f1cee7b82---goduduzakenufukodib.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/kofazipimof.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/bidanegetofawedadatum.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131b1d36025b---13200297915.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=operating+system+concepts+essentials+2nd+edition+pdfPDF 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_off0000b571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB571 15316 bytes
SHA-256: fcca4343bb54aea30681ba00ad8fa38fd9d650811284e34859e3bf4c34d5289d
font_01_sfnt_off0000dc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6C 11224 bytes
SHA-256: c31f201f090dab3c73228effaf9508cdf8dd48daed6095b08d98b4313d7148b9
font_02_sfnt_off0000f69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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