Malicious PDF — malware analysis report

Static analysis result for SHA-256 664d9ab33d89cb4c…

MALICIOUS

PDF

76.7 KB Created: 2021-09-01 21:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f2d9202680530f923297ba989e8f5bd5 SHA-1: b082c0ba7fffdc344f5d2ee5222df06bca3ab01a SHA-256: 664d9ab33d89cb4cbde00230321ba89dbcd5735e342fc9038a84b5e5ea3a234c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to websites that appear to be compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to directing users to malicious sites or potentially exploiting vulnerabilities within the PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://huntic.ru/uplcv?utm_term=ip+and+icmp PDF link annotation
    • http://baovethanglongmb.com/upload/files/23714003886.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/tnoihbkinhbjgghefupotq02l1/kaxawuvagosulikozomu.pdfIn PDF document text
    • http://thedreams.cz/files/mizuvituwunakononidij.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/tezevivobeke.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/zirofejovivira.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/40699006428.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/wanikos.pdfIn PDF document text
    • https://themalc.org/files/file/26997254360.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160fca8f9cba5c---bazuzev.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/42599824209.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/xorofesezataxapome.pdfIn PDF document text
    • https://luminex.pl/upload/file/66205361444.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/83937683241.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c208417c76---8372377916.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/zelanatekox.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/79543031606.pdfIn PDF document text
    • http://101balkon.ru/upload/files/65171694101.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a9102dbb8aa---94752580666.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608caf2dd8799---2965330135.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/38946391375.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/397f18b6ca9aa6fc7a9be4beca5ecf0f/93591033405.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d308214428---63195202706.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_off0000ccd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EE 9964 bytes
SHA-256: 6c9dbca9bad6bd80cde755d0ca7b47c9f5f44545db535c1af5d512244b154fbc
font_02_sfnt_off0000fad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD6 16476 bytes
SHA-256: 65257e04e514af276e8a25a198b33bcfda73ca5342b206c2ad54f7a650c86f9e