Malicious PDF — malware analysis report

Static analysis result for SHA-256 087388c9dbe28551…

MALICIOUS

PDF

67.8 KB Created: 2021-09-15 15:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c8a8632a785e46435df2567cb88a8165 SHA-1: df515807b4b1f727d3fa51b13fa562e61fd25f99 SHA-256: 087388c9dbe28551fe19974bc9d4ae29908d735402db1caaf21391e1c9df69ae
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected by ClamAV as Pdf.Phishing.Trojan. Multiple heuristics indicate the PDF is a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The embedded URLs and link farm structure suggest the primary purpose is to redirect users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4889

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://drafthe.ru/uplcv?utm_term=android+chrome+ctrl+f5 PDF link annotation
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8c7856bf8---kesodafekewog.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/sekizivedi.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/3248314312.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/83775812394.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/ziwubafewunobadejusudejon.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/jetevazuxuj.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/riwimunutiwididokedo.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/fig2tv5jm5i1qudvgogl4ijlap/revijuwu.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/bipesefa.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210905_FD50D1EE3C193E73.pdfIn PDF document text
    • http://cjpharmtech.com/upload/files/palipelajakolunizuved.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/21859432255.pdfIn PDF document text
    • https://ka-base.no/images_content/file/xuwowu.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb05a49b24---kutuvobapezafufibukejinup.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/gigokavunama.pdfIn PDF document text
    • http://topp.pl/_topp/file/68398604930.pdfIn PDF document text
    • https://arerp.kr/data/file///wivevunorifuwisopoweruvej.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/tp8ur6a46r2273q31ld2qlh4n0/81660655221.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/49245947600.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/zibedikifofozu.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/nuxonupalur.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/10379369780.pdfIn PDF document text
    • http://wsm.hk/images/files/kikedima.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/tevodemozusodepadojepi.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139a197172d1---5678719778.pdfIn 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_off0000b5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5EE 10528 bytes
SHA-256: cc49de6080192979179099f78e8ac58e2c43897ce92409fa26fce5ee4354f1f9
font_01_sfnt_off0000cdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C7 17684 bytes
SHA-256: 219d0d93812d8bc779cc209b0e4a3ae7525a1b61054042099b82e3283cab9937