Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bef52ff8c98a495…

MALICIOUS

PDF

95.0 KB Created: 2021-08-12 13:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6e0fbe6173b14cb92e7d2402e4a51436 SHA-1: 5faefb6f10bf3650dd6ef55d8e2a650752f3b8a6 SHA-256: 4bef52ff8c98a4957b94350532af5c4f41386f81d7c58da6e55abee520af15bf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=how+to+write+an+awesome+instagram+bio PDF link annotation
    • https://okazionche.com/files/bomemat.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/pujowo.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4515789b11---67206982019.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/aaf8e4c792b801e330114db15dd73434/dinadi.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/38443572967.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/jikokol.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/8323808561.pdfIn PDF document text
    • https://medtek.vn/storage/file/92803268764.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/mixafonanogokad.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/76573e50bdaf16fba95e8b75ab7540a6/jaxugubakijubana.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16084cf18cbcdc---66380257741.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/pivuxemazuwadujekefak.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/wafitakizulefewag.pdfIn PDF document text
    • http://qachs88.com/clients/58271/File/wavuwelesetuvapuwusemifom.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/77ec21041ca6ec76941337483f398f0a/78744816371.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/95081406225.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/turutujase.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/87401280708.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/1999c9bbe4e86da95087f57c1c23ee9c/tufekukadovuve.pdfIn PDF document text
    • http://renovator.cz/files/file/jepategokuzanajimij.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/8bffccafa008fc40183e61a2937b2dd1/lajajikesonoj.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/5sgv5cvglojr1vn8ple2amork8/84512348882.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/dc742f0e414695e8df90607a41369d78/19907495405.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_off00010d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12557 10620 bytes
SHA-256: a46cc82a4b1e2ed5e266912f7d21b7120326b75ed62f9def6f20b16c10292001
font_02_sfnt_off00013da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA5 18000 bytes
SHA-256: 23ae530a08bfd8b9e654784c995fe54ca66d1ba37a7aeb71d14370839893a248

Open this report in the interactive analyzer, or submit your own file for analysis.