Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd297dac096662e7…

MALICIOUS

PDF

79.1 KB Created: 2021-08-18 07:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0269897fad2780e1609ab5a2829c9c5c SHA-1: 2b67b4d9ce9b64afe123e206646c39e1353936ac SHA-256: dd297dac096662e7692e13b9313de1aa3d3c7159a9d0467d28b40c6e49a45dd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The file was identified as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The presence of multiple external URIs and link farm indicators suggests an attempt to direct users to malicious sites, likely for phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://talk200.com/admin/admin/uploadfiles/file/32880513393.pdf In PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/59974551360.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846ff47dea7---kubolifinidofepofidonowib.pdfIn PDF document text
    • http://riversedgefm.com/files/file/xuguwotivelopexelufamuret.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/89643044351.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a564f37e07---mewukefudetowu.pdfIn PDF document text
    • http://mobilenmr.com/files/files/15990174003.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/13199546769.pdfIn PDF document text
    • http://cutskytools.com/d/files/bamesom.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/21931497476.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/12720665746.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/68495288851.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/2039791dea1ec55138e02f281d23f42a/pumonavowomelewutifo.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/49572366063.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161003eb0f0e56---52518621690.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d171ce1101---5250144249.pdfIn PDF document text
    • https://fultoys.com/userfiles/foviviv.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/ecf8bvgni28o1a8pv2bhpr35us/xisuwireka.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/31829654424.pdfIn PDF document text
    • http://surtek.biz/image/files/20150118_205110.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/56880944174.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+determine+wire+size+for+ampPDF 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_off0000d0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E0 10748 bytes
SHA-256: 8aedaa6b6c8e9de29d8c5fdf99fc46bdb89e8d249cd8072b6306ca1fbb8f4187
font_02_sfnt_off000101a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A1 17300 bytes
SHA-256: f2be9d6f4a51061a7c84d21c2da39bdff62e02f0037568be51860e565ed288e1