Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed3a6bba40cd730f…

MALICIOUS

PDF

87.4 KB Created: 2021-09-23 20:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1320114b83c12bc99d41cd4eb73f02a3 SHA-1: d91133d9fe02f2a46ab9934823f22a980ba8a7d4 SHA-256: ed3a6bba40cd730f164bdf4c86a6b96954ab63c8ed2cacd6736300af20f0650f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links strongly indicates an attempt to lead users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://gregoryshow.ru/files/file/93086105220.pdf In PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/tewinofufuwidotaribobux.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c2723165a5---86403950930.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/wekupeputupibutu.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/mozizipinuboziwo.pdfIn PDF document text
    • https://normec-cm.com/ckfinder/userfiles/files/lovewatubuv.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/ca306fa3172555436034d883370a15d0/kosop.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/32564890909.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144f2327bcac---89945095808.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/somuginur.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/c5fc8b7c38207bb896e1cc5ed6f4d246/31034961948.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/vebofofu.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/77160497370.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/buwenepunerujusoti.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/97383514358.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210917064345.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/bujil.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/vudowagozot.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/23369467151.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210917005849_1695047218.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/sowazakavajugimalo.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/54911790217.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/418r55jpd9gdgdk90su4v8ni7o/newenenukizuwesifob.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/gukisazolokogozuvukelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+talented+mr+ripley+read+onlinePDF 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_off0000f044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF044 18260 bytes
SHA-256: b7838d101a9623628d419ef7d18433015c1ea5b41f03bebafad999c5395a5c1f
font_01_sfnt_off00011f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F99 10568 bytes
SHA-256: 29b48024468b5296f10df771ab1c4315c7c0beedb193af713be60bb0ae0fd81c
font_02_sfnt_off0001376e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1376E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1