Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ca785ba505504e3…

MALICIOUS

PDF

78.1 KB Created: 2021-07-30 10:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 47d6da9ba538008df3d42c9b440d6e9f SHA-1: 1d017727d17176eb14457526e293c5853e654baa SHA-256: 1ca785ba505504e30e34c36e38bd0bea72f23159b7f38d10f0cb638ccda609b6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The primary purpose appears to be directing users to external, potentially malicious websites, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://oniceh.ru/uplcv?utm_term=the+boy+in+the+striped+pyjamas+movie+free+download PDF link annotation
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/f0mkq2s259ltahdeutpbe9v13t/29220860342.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/2ea41678971baa036d891a3d73f2c2a7/68082506234.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/fukitiwunepezitafopumuk.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbb574872d---31474087844.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/38858003254.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/11f92fe1184b3c93141e404d4b283efb/tumixivubili.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/5o43qio4h01l8ao20n052qqql6/49307686031.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/sigesut.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/86648002784.pdfIn PDF document text
    • http://mahnomenalumni.com/clients/879209/File/39042998758.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/tijesuneled.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/cdbee786fbc0c3a6f86a60736b0cc873/babazalixomerawaw.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/dba081ed9f53b9638b42bb44e8bad2a4/26463532441.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/56841008280.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/79c3d3b002da39ab5a6c2444069c7e01/pigolizezojuwopolikej.pdfIn PDF document text
    • https://dm288.rs/slicice/file/bawozurofal.pdfIn PDF document text
    • http://zjxfjc.com/uploadfiles/files/xusowusefebinumu.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/3421bc79fb8067f44c79de7d5c3e19ab/ranurunasusiwuvojuj.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/be9686f169b0caf5e185ae8264cd286b/9222141677.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/1788578273.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4d7a98b81---pejixa.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6bae458c7---31860520870.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/63462558810.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/0710tu20mdc7vkk5asm0aai5h4/42565342142.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/11681926314.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/6329dcd1b7cb8360debfba3cb5cc7683/42995061516.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_off0000cd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD83 11264 bytes
SHA-256: 5b8726dac7bcdc64669a79364420b4ad2b8f0040fc3cbe7342b8abd99e94c50a
font_01_sfnt_off0000e78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78F 16240 bytes
SHA-256: 3bb51bdfd627a013a0023e866f5b319990d2b46b9817985d66bbdc492f3c513f
font_02_sfnt_off0001119f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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