Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e15efb1b890c93…

MALICIOUS

PDF

68.8 KB Created: 2021-09-26 11:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 46c5d5000bc1037ceed542ddba7f1dcd SHA-1: 69d408c6dc34170510b3430b77e48ad83bb30e19 SHA-256: f1e15efb1b890c9320e4d3efca7daadc81a49ef51b54ec537c295927b08d9940
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

This PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The document contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate an attempt to trick users into visiting harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nomylo.ru/uplcv?utm_term=wonder+movie+streaming PDF link annotation
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a117daaac0---levapeguxotumatenuxi.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16133fc5137bd3---viluruxojikemabilazawixe.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/wuzobesuregax.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/luguleselitikavazosopa.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/66311859904.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/79498298622.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3920058967.pdfIn PDF document text
    • https://aaaxxion.info/images/file/46429359185.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/53938418280.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/ed68f68bcfe8af57805a5dbf50104dc7/11477796146.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf715351d1---pizupenilaguxesixi.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/mirisuga.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/wifizaxataweso.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/naxawikelemerevuliwibano.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/rigedigifif.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/99f0edeed71206df3424284638c2e8e9/taxebugekixazasur.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/45594140166.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1614bfe8b7cbbd---volabebimesizoruj.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/laluzasore.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090204344629.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/budovovunusali.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/8419047193.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/46707152945.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_off0000b043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB043 14792 bytes
SHA-256: 476fa63a2b8e831d0f66dc36fe04d9b34b97c891f38d207640155825fb7c55d2
font_01_sfnt_off0000d595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD595 10604 bytes
SHA-256: a66924cf662e90dc7b4ca363cf7093f7ce2c26575d4806b1f8afa58f6eb81ec7
font_02_sfnt_off0000eda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1