Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa2d2b67fb9add4…

MALICIOUS

PDF

73.4 KB Created: 2021-09-18 07:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9c1372c7c2daad56f23d3c158a56b60c SHA-1: 694392bfb74e75dd81f5235a402447594fd1e00a SHA-256: 7aa2d2b67fb9add4bef696b3e134a2facac0ea00d009a7f28b55936274dcb06a
204 Risk Score

Malware Insights

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

The PDF contains multiple links to potentially compromised websites, suggesting it is part of a link farm designed to distribute malware. The presence of a 'download button' lure and a password-protected archive lure indicates an attempt to trick the user into downloading and opening a malicious payload. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=download+vlc+apk+for+windows+10 PDF link annotation
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0488c3963---modabunerafuderuvugimo.pdfIn PDF document text
    • http://trubaopt.ru/content/file/92354375871.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/56215402357.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/80525824848.pdfIn PDF document text
    • http://araulmor.tel-cor.com/images/library/file/zipugemebepavox.pdfIn PDF document text
    • http://erago.cidees.com/uploads/files/xisifune.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/35280849051.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/b9c4137c3c27662e4e154d8d0ce26c77/17338055200.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/507b8ccd40839dfdc23822e52bc7eb1d/76432323979.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/79558914811.pdfIn PDF document text
    • http://myesen.life/userfiles/file/44239520209.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/30527553002.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210908010441.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132cd4a679ae---ximuz.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/kofosigimumebagip.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/porerofatat.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pezunefeduwuxom.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/59376867320.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/jenasifovifi.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/44140402014.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/40568262538.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/tutizemozadiwuges.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_off0000bc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC2B 16988 bytes
SHA-256: 12a09c9842057ea2915ec4c8ff72d902643ae2ce991ea1a4a2a57f03f68f46b1
font_01_sfnt_off0000e748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE748 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5F 10800 bytes
SHA-256: 32a908a726c67bd5d08408034d0296aa550fe7ab19497e9153dcc379537d23ad

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