Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb7b6334c6fbfcba…

MALICIOUS

PDF

86.4 KB Created: 2021-09-06 07:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6493499a169d651270fb89915e2936f0 SHA-1: 5ce5c2110119b913df7a3bcdb86820f3027fe369 SHA-256: bb7b6334c6fbfcba327457108a58474c54e9f44b6835e3fc124b9a69429c6c3d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://stellarp.com/userfiles/files/dezotosagisisojozoj.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160773c4965dd3---veredozurakugugewadovu.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e1f9e53f2---93151805807.pdf
    • http://labotinnghia.com/img/files/727004104.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3ce6ec7b4---44082626364.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cacd573552---20233118093.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b898e5021b2---lumelivajomifuv.pdf
    • https://vanvoorst.info/uploaded/file/sezixoxeduriromid.pdf
    • http://timecraftz.com/userfiles/file/kojik.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5404e7252---28681080022.pdf
    • https://galerieportelouise.be/userfiles/files/bozura.pdf
    • http://kamerton.nl/clientfiles/46053585442.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/068c21574ad8118f71aac6e825c8fab3/44591722828.pdf
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/runiwefixajikogol.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c915581c00c---wutovorewu.pdf
    • http://stellarvvv.ru/ckfinder/userfiles/files/veramekifufufugigituwo.pdf
    • https://dienlanhhonganh.com/images/pic/file/28014695091.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cb24d0310---51525087897.pdf
    • http://studiotecnicomartani.eu/userfiles/files/sodijogo.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c3328991988---39222436740.pdf
    • http://chocoenglish.com/_UploadFile/Images/file/vexosuwod.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/4404e59ff0b5359ca631076a94f2e2ce/kudamivujovet.pdf
    • http://akbarestate.com/survey/userfiles/files/34503205146.pdf
    • http://laclonghotel.vn/upload/files/42150269393.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c548c16183---gobogat.pdf
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608518bf0a134---97281820367.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=pass%C3%A9+compos%C3%A9+plus+que+parfait+exercices+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e38c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE38C 16792 bytes
font_01_sfnt_off0000fba3.bin
2ff03b3011c98b9fb56ac3c55b687b29af23682015b8eb5d007351dd82d5851c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA3 11180 bytes
font_02_sfnt_off00011557.bin
6939798270e79c1cbf805baa50a1c45fc16de5bc8fb6e8af94199792e724247d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11557 20684 bytes