Malicious PDF — malware analysis report

Static analysis result for SHA-256 a948df1aebbb3974…

MALICIOUS

PDF

73.0 KB Created: 2021-09-10 00:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eeb85227265ce555458b868a5733c6a5 SHA-1: 953e77a4a1a5edfc7cefcf6ff9c13f2783061034 SHA-256: a948df1aebbb39743ff1e2ba721996b6014b8ccee15bce3887663349b54ca9a3
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as a phishing trojan. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The PDF also functions as a link farm, pointing to numerous external URLs hosted on various domains, many of which appear to be compromised or disposable, suggesting an attempt to obscure the ultimate destination or evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7043

Heuristics 6

  • 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
  • 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://colegiumaniucarei.ro/ckfinder/userfiles/files/molezitonomanesukaxa.pdf In PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/53233243302.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210908171158.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/matenarekogebinolawadan.pdfIn PDF document text
    • https://www.algeos.com/js/ckfinder/userfiles/files/volebizid.pdfIn PDF document text
    • https://linker.tw/files/27153218005.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/vogolo.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132cc24439fe---18464198693.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/gimusigelilosudu.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/85632529895.pdfIn PDF document text
    • http://asid.rw/userfiles/file/84987337792.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393b3228448---jejava.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/1474471431.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/3608398892.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/foboxonegar.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/50644869183.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7b9bb2341---mepejimoxubejevule.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/39233147790.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/xifugatazomugijuxogeneguv.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/komerakofame.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133de2cd29c2---fedazixozazilufibegu.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/farumogemam.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/betoz.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613736773e10f---nuzanivawovefus.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/c537aabff5384ecc61d86954367cbd93/xolotulatamenagesurulokim.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/xamusawerawofozitevolo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+make+pdf+of+photos+on+androidPDF link annotation
    • 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_off0000d3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC5 17960 bytes
SHA-256: 410a1d32bdd24486087a16b0b8f155ee2165ad0c3cc5b7ec7061b2bae5bd2b90