Malicious PDF — malware analysis report

Static analysis result for SHA-256 557c7b119d326166…

MALICIOUS

PDF

67.9 KB Created: 2021-09-06 06:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 125fbb92bf3889a753f6d9a06abb631e SHA-1: 3843d33c3d0208dd2aecbc20776bc9bc2c69b980 SHA-256: 557c7b119d3261660bcc46a241f2964043a1e58f8f17344bacdd464d075ce3d5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress upload directories and other domains, suggesting a phishing or redirection campaign. The ClamAV detection and ML classifier further indicate malicious intent, likely to lure users to malicious sites for exploitation or credential harvesting. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5231

Heuristics 5

  • 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
  • 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://www.nstoplana.rs/ckfinder/userfiles/files/jilanewemufofodubofosip.pdf In PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/0frp9hjrvgj36vnjfgm17hpdrl/xapivonepegelaxoke.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/49965801056.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/kuxexetawiladakoxotoxo.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/31189065272.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/kezivigedukekisu.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/c23f75cf12825fedac8a248ef0946f45/zutikirumarise.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16126edae0bd1f---90805798244.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/11167798506.pdfIn PDF document text
    • http://hasyo.net/files/file/wapotiroxadifazuna.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d42a5e7dc5---22812991180.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16083c01c2a96f---86685791810.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/45170218123.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-8-7/20210807041426887875.pdfIn PDF document text
    • http://findplusltd.com/file/84670640728.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/516205cd9b6bfb80961a797d25297eb4/59678324685.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/f5e60bd9c1fd01f6f7a3a5ccef845fa9/72340552604.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160974e40e0c11---jazatako.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/64683025184.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/7ac74c9d8baa8c10cc54f06151362340/senuwizewonalepe.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/77819308719.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/rawalolo.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/76378581765.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/dubokote.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/welimobaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=molecular+diagnosis+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CF 17024 bytes
SHA-256: cd8574ac319efb20f847d47c486b5d427e9e6e531558d19956cf2e6524aed7a1
font_01_sfnt_off0000f281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF281 10788 bytes
SHA-256: 4a014f1aa59ffc3d8e774fda7706f3945cac98f1bea8ef32d3ea9a8ccaf75da7