Malicious PDF — malware analysis report

Static analysis result for SHA-256 b30fb66bdaf0a3ed…

MALICIOUS

PDF

78.2 KB Created: 2021-09-20 15:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 315287a8e45a6d90faab2ba373716146 SHA-1: 9ef1dc49898c9fa58dbcf6415edb1666a4184e1b SHA-256: b30fb66bdaf0a3ed9fbb0928a1bd05b59b0fc119ce72e0fde2f86d2b09bb7ba3
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document exhibits characteristics of a phishing lure, specifically impersonating cloud document sharing services to trick users into downloading further content. The presence of multiple external URLs, including one hosted on compromised WordPress infrastructure, and the 'Password-protected archive handoff' heuristic strongly suggest an attempt to deliver a malicious payload. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://smidgel.ru/uplcv?utm_term=winzip+rar+for+android PDF link annotation
    • https://marwaautorepair.com/nbloom/fckuploads/file/titikisi.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/wafanal.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/85847837556.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/nufezusepabopivufipan.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/40801072728.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/mixivozomebufisoxoz.pdfIn PDF document text
    • http://meskerjager.nl/media/files/razenosatifenijek.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/xivezibozuxetibofujufu.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/bebolirolakowonivow.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/49561878059.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/47309008905.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/62646813750.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/nibopanuximamixaruxol.pdfIn PDF document text
    • http://gr-chem.com/upload/files/disixewusovizusojowumun.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/jewarinemasiv.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/93241850352.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/89650377990.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdfb7703aa---31377336941.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/25777448982.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/94781337726.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/wamejamexoxivejidezosama.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/fivifu.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614048d999799---lepidari.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/xojirutetifu.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/13314903219.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d78df12fe---28684265028.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614474da44da0---lamame.pdfIn PDF document text
    • 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_off0000cfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB0 17256 bytes
SHA-256: 7bb43004ea08c2a177b9dffb9b69169be119afcffa01967f04ef8eaa9c4feb69
font_01_sfnt_off0000fc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC59 10100 bytes
SHA-256: badf88a5d61e38eeed1e15c9a065c0bb2ce0afd31374c1ef347698ae64b76509
font_02_sfnt_off000112f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1