Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0053fcd3b76ef87…

MALICIOUS

PDF

74.1 KB Created: 2021-09-23 11:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6bf8c73b4e2ff489e3f717c09d9643e9 SHA-1: 1e479f1ade6299279b6057a013afdb74de4e3a48 SHA-256: a0053fcd3b76ef87754eaa314e61aaadd23dd07767ebcbbefeb4d7e7797d550b
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are identified as a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or malware distribution. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://inwebjor.ru/uplcv?utm_term=panini+roblox+id PDF link annotation
    • http://soundspace.eu/Upload/file/nabikadeduvak.pdfIn PDF document text
    • https://vzglavniki.net/data/file/79829586228.pdfIn PDF document text
    • https://megashina24.ru/files/files/50954720849.pdfIn PDF document text
    • http://osayit.com/images/file/64856902361.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/40450338992.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb2a7ecd49---jiwaj.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/57017766284.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161492efa42b95---kizapiripumebofiwovuv.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/91428293935.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/69477715399.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/51848197079.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/bolumiba.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109011100077111.pdfIn PDF document text
    • https://promise-land.com/upload/file/43182776710.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210904_213650.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/68728227225.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/92b3d85ac72f95c666d2f010cde8b3fb/43528085071.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/24414213064.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/69074967732.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109190555205019.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/51616921954.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/mozumexogele.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1630558806.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/c694b4e1516e17888495a41356f0abc8/wolovanubu.pdfIn PDF document text
    • 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_off0000c0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F8 16676 bytes
SHA-256: 5ec157a8da4aa764e6807d42f08bea86f7c4d1391c28dab580a7bd8c1893da86
font_01_sfnt_off0000ebf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10410 10088 bytes
SHA-256: 10625d292cb5f66a77665b309e5022cd991ca72a3ecd4afc7d9d2ca380d0b8e5

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