Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb1fb6c4b455dfbc…

MALICIOUS

PDF

80.9 KB Created: 2021-08-31 15:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 44458130f29858e9835b0af6e45eb3aa SHA-1: b482505860225ffd0c0fc5bf37aece06efd5d447 SHA-256: fb1fb6c4b455dfbca535b726e39bd98650bd39fa96befdc72f9bd79eeef5b9d8
156 Risk Score

Malware Insights

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

The PDF document contains numerous links pointing to websites hosted on compromised WordPress installations, indicating a link farm designed to redirect users to potentially malicious content. The presence of ClamAV detection and ML classification strongly suggests malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://nomylo.ru/uplcv?utm_term=whats+a+non+exempt+employee PDF link annotation
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092412377a89---benubave.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/17513adce7e3472a3d677baf02a93aa1/4115038366.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/80428508640.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/f1cb1813af300cf763bd572afdd4a264/sofarenatofujed.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc4210e17c---24918331366.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608203e037321---51286143429.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/f60a6acad5aa3bc2802f947813194a33/povotazunarokuvebume.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e121be54a---13028693091.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ej5h524af7ql5dvc1riuflk2sd/70966359194.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/479ef7d51e8ed4bcc217ff52f7745960/35490982852.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a034c2150cc---9960246741.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/bifoxusisabupokunofeko.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/todabizizewerim.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050115570869.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/34682273857.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/1bd53544c7fe6c48ad5a8c9a612a6843/4533981525.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/kezazozirunopesojow.pdfIn PDF document text
    • http://renknh.com/ckupload/files/80143344285.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/62161415238.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/28479991583.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0bc097e85---85365034206.pdfIn PDF document text
    • https://jagamimpi.info/contents//files/8129067995.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/bumevemikaxe.pdfIn PDF document text
    • http://schokozentrale.de/idata/veripetipukiseva.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202108192135152574.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/tamawifufijulomup.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac81d6c269---34502000054.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_off0000da78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA78 10532 bytes
SHA-256: ee7fb00b9f3803aba2019a9614f34fb2019b7e8f690e489513f28ef26ed10eb0
font_01_sfnt_off0000f25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6E 16828 bytes
SHA-256: 4bc9945ec99c53e4f5d5a63d3f4ed1eb8706ed8972c8e411cf160c3763235d3f