Malicious PDF — malware analysis report

Static analysis result for SHA-256 4999ddd191d3b79a…

MALICIOUS

PDF

84.6 KB Created: 2021-09-08 07:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: d3179a8c262db2d5d6583ec5bc68289b SHA-1: 5f52f8a6b2e0adc06542c9dbb9f896d5e284261f SHA-256: 4999ddd191d3b79afd650d507dc3afae43832ce9510fea4d1d46c01f4d66f90f
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • 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 http://inwallendorf.de/userfiles/file/21906678053.pdf In PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/24852065081.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/dedubaralexel.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/161353c6118189---88269254975.pdfIn PDF document text
    • https://clove7.com/userfiles/file/51989465855.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/31823561656.pdfIn PDF document text
    • https://birudongker.com/contents//files/45918668347.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/ee94989e401cd903dc9ad0cba1baf2d9/sugijogajabagazuvirirow.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/sizigiviwovizogavabizot.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/kidul.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160876ee57f889---60502604742.pdfIn PDF document text
    • http://stillwaterponies83.com/clients/74660/File/fodoligalisexopakite.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/dusaxefawopobevava.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/73934086154.pdfIn PDF document text
    • https://priscar.com/documents/files/dadikinumuse.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/10524862738.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607715856f25b---nowibo.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2d6970cfe---xadopalonunugikixe.pdfIn PDF document text
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/58841160588.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e40b2ac09a---bimezoduvugo.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/zojadibebabugetosiwo.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/23577149101.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f7a0c34bf---93265178859.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116c75d1954a---47165645103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=merubah+file+pdf+ke+word+dari+hpPDF 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_off0000e534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE534 18072 bytes
SHA-256: 72baccde09da5b32079e2489842f23e2742c4911e73359cf149c51824b2479fc
font_01_sfnt_off0001146a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146A 10636 bytes
SHA-256: a93ab29e50d08d574f7a191e36477e7c2125cdea0e88568e40f304dec074f7fe
font_02_sfnt_off00012ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1