Malicious PDF — malware analysis report

Static analysis result for SHA-256 d532bc71e30d1b6e…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 23:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fb2e628441b939308b1439bac20eceb5 SHA-1: b9bc9bbbafee5cf68911568f99e4ed01afacfe09 SHA-256: d532bc71e30d1b6e494b91a15812fb896252cc1b27fb1e33283e7769d75a8da1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. An embedded JavaScript stream was also detected, which could be used to further exploit the user or download additional payloads.

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://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/esjhup8mhdua81adnneqf8ocok/5208403573.pdf In PDF document text
    • http://eskuvoiiranytu.hu/blog/file/fofevixalabizaride.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/69339075833.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/novovosilodot.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131a9d6c47c0---watowijesewufimagonow.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/lereno.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///72431745281.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/3040805338.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/xazirelawozizovet.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/96606986617.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/19597069559.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/hu1o74vhf181uh41adi40rm421/47398100739.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/9926917358c3ce9c725f2c7af2930103/vamuv.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/minexinogimenovaterafe.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/38481469387.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/946fb3fc5465bd0f08ea0cbd2b37e6c5/bagasaduzurejuvof.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/161452df76fec8---giwapopofatuvoxalimotubo.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/muvep.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/nejuwi.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/11628981531.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/luledebedik.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/berunopu.pdfIn PDF document text
    • http://adriennemason.com/assets/files/tusunujixax.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/55709167107.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/98896768485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=watch+the+one+and+only+ivan+freePDF 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_off0000b19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB19D 15076 bytes
SHA-256: 364139707b1fe786ec62a003b25b3f92803cdaebf84df2c7a4e863cd63e9010b
font_01_sfnt_off0000d784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD784 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9B 10576 bytes
SHA-256: 4fa79c0b331a9f9b02d834beab1f76cb59e6309ce4d70043e30e3f599b38bba4

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