Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cfef6e7b0bf8b3b…

MALICIOUS

PDF

83.8 KB Created: 2021-09-14 05:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e124d3141cf9b88667c4ff920d60ff50 SHA-1: 62ddcfcd92229107545823595d9a6416a900979d SHA-256: 9cfef6e7b0bf8b3b3cf892180124afb052bf20e84ffbac46b7e704d898b6a033
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a link farm pointing to compromised CMS upload storage and disposable hosting. The embedded JavaScript likely facilitates the download and execution of a second-stage payload. The link farm structure suggests an attempt to distribute malicious files or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://hadt.vn/upload/files/lonagi.pdf In PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/15537429093.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/0a13b2fc4a67ac6a1f8fd6807a0ba4b8/46650341689.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/67757248185.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/63387107211.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109032003013203.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/28144055577.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/sukatejasawefudawipus.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/08/file/20210908_135158_181.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/32755966489.pdfIn PDF document text
    • https://nexusmediation.nl/files/vivemopemado.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/sakuwumu.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/71047389165.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/2a6b4dcba6bcf48fb95de28114284326/lamuwosavinebofepuxatudov.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/vopevebinoxovogawisefi.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/49875899530.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/27751377769.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/kapejilodi.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/kolalid.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/15277432211.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbc7674dee---vobum.pdfIn PDF document text
    • https://jin-ji.com/upload/files/94469256163.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/81939436806.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=wwe2k19+apk+obb+downloadPDF 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_off0000e405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE405 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1C 10580 bytes
SHA-256: c7b565336f6815c7b60713300585357f25740eba8e73b23e48c4f84231dca530
font_02_sfnt_off0001144a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144A 17700 bytes
SHA-256: 4278ea5a8d5ac7997e2f4d2a18ecc3d5c0ad93cde0feffd7570af1242d5ccb16

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