Malicious PDF — malware analysis report

Static analysis result for SHA-256 255baee09544a28a…

MALICIOUS

PDF

72.2 KB Created: 2021-09-03 15:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1d70c1c9fe31f49d7e4eafeee3a2da7b SHA-1: acd558081bae4532c11a878b70e9c863ef9fd02e SHA-256: 255baee09544a28a58e15d1edac07ef1f656c15d1f425a1413ae972455b4b36f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites or disposable domains. The presence of these links suggests an attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • 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://balajihighfields.in/userfiles/file/70515154677.pdf In PDF document text
    • https://mama-light.net/business_school/uploads/file/32863737577.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/vbvgsclv147sdbtetemtrftcl2/1069614353.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/f97d6c7c9e2b609c2012ddb618057f09/88000363267.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/19976262636.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-8-10/20210810144208721963.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/wawijamajikelewiwexatidat.pdfIn PDF document text
    • http://canadanur.com/resimler/files/zevisedotuxob.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/menonomozozurul.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/98092140003.pdfIn PDF document text
    • http://tcihk.com/userfiles/71352784560.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/74oq2tf390rh792c4vnrpotuc1/rojafunutupiwotimevuluv.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f076da33d3e---69324602434.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/12913489027.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/tolotojodilirewafup.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/dokuxuwefov.pdfIn PDF document text
    • http://zae.me/datafiles/file/pulub.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c4d18b023---dewekonazan.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/lamusatenesewegixi.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/wagepozatularisamisa.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/20957043927.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=english+result+pre+intermediate+student+book+pdf+downloadPDF 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_off0000b45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB45F 17096 bytes
SHA-256: 5e9c1f448061f6a3f762bd1f6d3886c104abb5226acf21b80da6f405be6fbc9b
font_01_sfnt_off0000e061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE061 11348 bytes
SHA-256: bb72a11f3e0ee9fd47cbdfb0027c26183136df6036303b8a515329a0491ff967
font_02_sfnt_off0000fa82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1