Malicious PDF — malware analysis report

Static analysis result for SHA-256 2537e229f53dd1dd…

MALICIOUS

PDF

88.6 KB Created: 2021-06-26 21:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2aeab9bd612c7830a1384c019010c7c3 SHA-1: fa0e09a6ff0f5a479a4551f52e2b4dea8e93c1de SHA-256: 2537e229f53dd1ddc7970f437667471c60eabfa6984b54f5249e1d71fde9c630
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or link farm attack. The primary goal appears to be directing users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/5d389774ba3e198608597d8279bd0b6b/nemifuwerawamo.pdf In PDF document text
    • http://aqbnb.com/uploadfile/file/15639887325.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/9f29f8ad2785a5cf8fba605806b2aa5e/28420034378.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/64273510705.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608016d55ebc5---texubifoxuvexejirimapere.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f56b7abe44---pomotasowapikuwiwezak.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/namesaninetama.pdfIn PDF document text
    • http://onlineexpert.in/userfiles/file/24505573242.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/mepedetepagemojas.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/letijuwika.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/numeroni.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/vegogig.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e1181387---7204059890.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072cf054caa8---1191967833.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/67823364060.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/zomodugokomuzim.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ef40966f---bomikaburezesalomegup.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092945a05a58---nepofupisejutebe.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/99779513545.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/232hhppcaa3illf6uq8r479ur4/moxumidavonedusokiwilizim.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/r65sk0foke3a33l1pul7k6nac6/takijijatajatomaramumixe.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/22b7446754181c5c515c5c00a75b05c1/43540218835.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1077023365---71780964848.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b0382b4c7---94496066268.pdfIn PDF document text
    • http://vinmexindia.com/uploads/wekimiwuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+lost+heroes+pdfPDF 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_off0000f93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93E 10200 bytes
SHA-256: eeee105cdd2b45762e54d3c8d435011e4ef0afdc85f658d24b043c1f2687e218
font_01_sfnt_off00011043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11043 17280 bytes
SHA-256: c7b131e939ce91462a51f328e215675b6b9c0e6f51c528c5f5320c6372b9ac22
font_02_sfnt_off00013d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1