Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99b7e2078122cd3…

MALICIOUS

PDF

87.2 KB Created: 2021-09-21 20:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 27eef16dd23d580c9931991c09d2c5a5 SHA-1: b5927c6f0f7c9dcecc44a18ed294606204ff5b5d SHA-256: e99b7e2078122cd3c0acc2ad531a511871c8f1d8df4631aaf8d05bbe4b930196
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://amandamaitland.com/images/file/67242550054.pdf In PDF document text
    • http://demo755.webbazaar.com/uploads/gufadike.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/xomodekefuwaw.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/336akov7rcl8lreb5hv37ujk30/duvuririnipo.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/21630963476.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/bomefororepaso.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/36978531498.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/29833945407.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614603e2d969f---30629819809.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/7fd19f54b3f36c63422553ebf4d7c6bc/fugazigufenojakafiwi.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/lefudos.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/sobuwerogewolokokikufo.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161302370e560f---69498472447.pdfIn PDF document text
    • https://turbooto.vn/upload/files/46899047664.pdfIn PDF document text
    • https://sambelteri.com/contents/files/wamazibuj.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/48190835882.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/finogolonatuwat.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/talotezopijojizalir.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/zujezegidigemoveva.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/26795789170.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/zorutemizipeninu.pdfIn PDF document text
    • https://karthikaspices.com/uploads/file/tamavikejonojirozemotided.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/27457235324.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/71527495545.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=wifi+map+pro+and+vpn+apkPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b484731758---84260633736.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_off0000ea30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA30 10368 bytes
SHA-256: b7c1f1582e2c26ba3dd84aa313fc185033ed2a94f3c2d03bb1abe649d7cfbb68
font_01_sfnt_off00010184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10184 20144 bytes
SHA-256: 0142322e2b1d04a2b19cba54a66fdf5048e0d23200434ceee5e34a6f79e0cc83
font_02_sfnt_off000136a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1