Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5fc8ee595128b7…

MALICIOUS

PDF

75.5 KB Created: 2021-09-18 20:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5a2caa761f57ce5440adc4e709fc95d7 SHA-1: 41ba561bb49771e47ec3cb8e73bd106b47f609d5 SHA-256: ae5fc8ee595128b798bc7daaf6344618b68768725751c6288ce97ddf4eeea5df
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 point to compromised WordPress sites. These links likely serve as a link farm to redirect users to malicious content, potentially for phishing or further malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://drzwiukryte.pl/userfiles/file/patarezovofizivone.pdf In PDF document text
    • http://vinczeandlaszlo.com/upload/figomejaz.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59294818566.pdfIn PDF document text
    • http://hongdacable.com/d/files/kubuwelepogipanas.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/fojawosunasa.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/51807353.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/74871950093.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f3d646d2a---21433093981.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16145cb153d34a---jipegadifesap.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161344c3a42082---xukiwoganudejigeme.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/70036642921.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/wexevefitovixupenito.pdfIn PDF document text
    • https://emenu.hu/editor_up/wenetebositodag.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/gizupevokunimotorusukel.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/nonozuvu.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/10889629582.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/32511113870.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/pavexifurasava.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/375447652.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/zagasalimisesovados.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/81282865454.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/wemiratimudadekez.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/99151658159.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/1181486447.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210911170559.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=addison+lee+android+appPDF 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_off0000c3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC1 17536 bytes
SHA-256: cfe5b0e7b06fe1202700bdc2c085d491f2ff0c3bcdf86d45da3705d794d871ee
font_02_sfnt_off000108f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F7 10268 bytes
SHA-256: 617800ef03ad2f00e3c0aca5519190b65db1e9f39ea73affbf5b86120d5a16af

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