Malicious PDF — malware analysis report

Static analysis result for SHA-256 f224b2214abcd69d…

MALICIOUS

PDF

85.4 KB Created: 2021-09-18 00:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3a57954a47910b77b2f50dd91130dffd SHA-1: f781e99d3a43b033abf3a14f3a6d827a9131627b SHA-256: f224b2214abcd69dcfcb9df56437ecd41250f0907774dffa8d3b623e179c3dc0
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. This structure strongly suggests an intent to redirect users to malicious websites, likely for phishing or to serve further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9830

Heuristics 6

  • 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.
  • 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://xpeedon.net/userfiles/file/20210910050341.pdf In PDF document text
    • http://globalbizkorea.com/userData/board/file/30471793082.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/77094450745.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/sejutigaxexotudo.pdfIn PDF document text
    • https://j26clean.com/upload/files/xolelavazorugola.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/54079857610.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/46272724122.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/lafiwajaw.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/92407780677.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea1ec5a6da---talati.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/90459909422.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/dcd7b94714e68a1c084e6a1161e22cc6/23289736928.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/madifuwovipugosoweduzaz.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/rawofuwiwomojeb.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/mikiju.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/bokejetiwij.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/61088511380.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/154309980561394bb44c6a7.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/wogafen.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/norogovu.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/gizawisitupiru.pdfIn PDF document text
    • https://music-group-store.com/upload/files/xavofamakibijakogol.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145026a2e83d---24555257514.pdfIn PDF document text
    • https://digireg.lu/upload/nugifopiguwodavoxal.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/1210466976612f058b8743a.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/50610768626.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=virtual+sim+story+dream+life+unlimited+moneyPDF 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_off0000e6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AF 10696 bytes
SHA-256: 6a679b88d9e7908eb235b1707103aad51dcf164d8b553880433178b09e813737
font_01_sfnt_off0000ff4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001175c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175C 18896 bytes
SHA-256: 510a98ac1df9a3468754332784e1f42b14cc9a398faabdcd61bc1eb1158f511c