Malicious PDF — malware analysis report

Static analysis result for SHA-256 22d949b55dbfc285…

MALICIOUS

PDF

80.0 KB Created: 2021-09-08 22:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b224ada3b6d895109309285a9921847b SHA-1: c95409278141e2d4e9f7091c76664c7080ed4759 SHA-256: 22d949b55dbfc285dd74747c2e4d908c4062d49b1cf63ec9a348d1c02c47fa9e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bocghebinhduong.com/media/ftp/file/6014169552.pdf In PDF document text
    • http://jubangh.com/Upload/FckUpload/20210901file///39281214816.pdfIn PDF document text
    • http://agilesolutions.in/uploads/94161890032.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/fanimekosapituteju.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lvl45hpujv7b84cg50h1n8teb6/25659154994.pdfIn PDF document text
    • http://ilkemymm.com/image/files/35512713002.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/tapiforobipemexatirazat.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/933315cfb01fc00c34ae161aa8d86fbc/vepak.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/titadoruzov.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/19695960034.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/65167728699.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/58028949838.pdfIn PDF document text
    • https://bdata.vn/upload/files/bagurexoduxatadum.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/03/file/20210903_162119_104.pdfIn PDF document text
    • https://alariel.be/userfiles/file/32526642541.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/pepakewi.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16131c529ab09b---67071139807.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/39200859271.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/1161599010.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109050738033623.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210905172905_722859025.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/63091955419.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=import+videos+from+android+to+pcPDF 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_off0000d4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E9 10752 bytes
SHA-256: ddb417104f265da00558b6e1922fbb05daf52b419f6668675906587c6bc58d54
font_01_sfnt_off0000ed9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9E 17724 bytes
SHA-256: fe3f6dbf3a34b7d4e50a27ba7c7434d1f46ca6da706ac1ce7794bbb3bf8ee268
font_02_sfnt_off00011ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1