Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ab86ce642198f5c…

MALICIOUS

PDF

82.2 KB Created: 2021-09-12 13:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ac7d33633585b8608fd044453dc5cf5a SHA-1: 9d77a088a203680e478288ba4a85e8701cb8cfe6 SHA-256: 9ab86ce642198f5c2ce4cca203208474370ae362cbd5af8bc0b737e7845b98fb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The heuristics indicate that the PDF acts as a link farm, directing users to multiple compromised WordPress sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these redirected links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • 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://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/81ef80b847976e55398cab101e7d7e8e/furazowagebafumunimotuxi.pdf In PDF document text
    • https://cuatudongsaigon.vn/uploads/files/66524456231.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/lekimewasewitufedip.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/pirexezikavexanadosar.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f43722240e---rabafivefujokovefiga.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/99120399871.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/zumamivelekijabifijazi.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/tubeleluvaxarefu.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/xasijewogof.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17030996021.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/pusexajuxetopamebef.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/wixanugejujojinafazena.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/62741220616.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/91807427674.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210910231300.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/32936070540.pdfIn PDF document text
    • http://hbaoge.com/upload/files/nepowilawukusoga.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/katejeponodemuviwidorulo.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/8947569656.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16130b54b4a5ce---71414574460.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/98629726756.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/ec56439595236c00315639d88792841f/57489404667.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=multiplayer+online+games+on+phonePDF 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_off0000dd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD32 17456 bytes
SHA-256: 3756c7c306ee68da29ad929b6602d85b83ada9b853c49fd57f3466a74343b00d
font_01_sfnt_off00010a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A31 10908 bytes
SHA-256: 2b6d7f0067994d3d9820188269d65d6114ac308753edc57dce2ced0cca9b1115
font_02_sfnt_off00012343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12343 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1