Malicious PDF — malware analysis report

Static analysis result for SHA-256 47ef0118cc2df6a8…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 18:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 39a35317aedb4a5bc56e813a8cb33ef1 SHA-1: ea965b7c567c4256758681262cb849d744effbd1 SHA-256: 47ef0118cc2df6a8a8e9c2631502f1d568f4cfebec5a5f0395e4a211b1154760
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are hosted on compromised or disposable domains, forming a link farm. This suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

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 http://isisthailand.org/file_media/file_image/file/gadamoxeb.pdf In PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/37935317588.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/pixedugezilazo.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/witekapotonej.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kuwuvekujizisenimexip.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/20219112145405180.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/13709140412.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e09dac83cf---wukutopowawig.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/gogifenamo.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/7492572652.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/mujijoxigaxupifexipav.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/20219918204374.pdfIn PDF document text
    • http://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/82592118563.pdfIn PDF document text
    • https://paradigma.bg/uf/file/18637475985.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/14687476825.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/b3b65402d9d3a26fb658a126ff58e4a0/76685693185.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/47248934560.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/69405289754.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/2caa6d258931f9373a1361a2d06e4d06/zanelulezatumif.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/likofowovurekibana.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613258e125906---modafevojudekuwewuti.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/56020607443.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/52514119799.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9a2a9c6deb3b2f4cd796a4fece61ecac/939077006.pdfIn PDF document text
    • https://polytex.de/sites/default/files/rojikukekeze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=lord+of+the+rings+the+two+towers+stream+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_off0000da18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA18 10796 bytes
SHA-256: fd46f89d74b90e03f4211b61f6d3263fbd15acfd2e652f6705eb74797bee4e73
font_01_sfnt_off0000f2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A2 18476 bytes
SHA-256: bc51d00101c5cd38fd136ca2b2463854ad89cee11b63cd676a8eafc97d7edeb9
font_02_sfnt_off000122ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1