Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d32f58656ab4a5…

MALICIOUS

PDF

79.6 KB Created: 2021-09-11 18:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 764ab2deb39dcff2d9427dd4fdfaee13 SHA-1: a36a001e5a315cebb6bea823f2d02767553feade SHA-256: 98d32f58656ab4a5987b34a59374c7447226549bc8aec865e6420841aa41a2a1
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://elskup.pl/images/assets/file/vaxetegizi.pdf In PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/4463412217c55a9a17f5f4bb82d46413/zopiwidilufufibuverexoge.pdfIn PDF document text
    • https://onlinendttraining.net/files/lapogukiwiwodiwunixiw.pdfIn PDF document text
    • https://visualarchive.bg/files/rozurakuvivovepuxux.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/jubapumaliri.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/regidem.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109091538565581.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/12449467326.pdfIn PDF document text
    • https://gestcargo.com/uploadfiles/file/93661381973.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/faritomexodezodafawuboma.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/19528873159.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/wametewurufuviwevu.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/xolarabojozemet.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134609790858---70315767053.pdfIn PDF document text
    • https://digireg.com/upload/dopivabibizuketutofimebir.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/mugepujitakawupodoreni.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/xozukasosuxugejaketekix.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/a498c0c8ba8258278a63a9039db40d24/bovir.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/vakojiza.pdfIn PDF document text
    • https://taperagi.com/contents/files/46639767440.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/puterojar.pdfIn PDF document text
    • http://glttek.com/userfiles/file/99666989939.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=a+positive+word+that+starts+with+pPDF 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_off0000d692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD692 10472 bytes
SHA-256: 88dd768b2566cb1adfdd4d8c72c8117d33ed8c3ff0e08351cf6336f125605f7f
font_01_sfnt_off0000ee9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9C 16524 bytes
SHA-256: d2dad5c1e3111a771a5acc69a10909afe8d5468901f522fd2df3684b3ababed1
font_02_sfnt_off0001191e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1