Malicious PDF — malware analysis report

Static analysis result for SHA-256 6081f17d14521d1a…

MALICIOUS

PDF

56.8 KB Created: 2021-09-08 06:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e938428388e2e84a612bb5530e80f77c SHA-1: c0b02f5572a3f3065b82db1417d8e2871a32070d SHA-256: 6081f17d14521d1a59ad382c3f9856acd901163b7d1aa327fe60ab33f2f1ce52
154 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous external URIs and links pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The PDF structure itself appears to be a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9413

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://queure.ru/uplcv?utm_term=preclinical+evaluation+pdf PDF link annotation
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/0e7bcc563773f651bd4cdcc91251c0e7/56507143460.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/20324584324.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/655642421.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/92840632164.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/ef90c5bb7684d20c8c142c7fc90659af/bunibijulodawusanid.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/6504196a1a53863adedbc57ce49a550d/jonafogovokosuxaxel.pdfIn PDF document text
    • http://orem.mn/uploads/files/fuloko.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210620133504_6lce64.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/takuwa.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/ff21fc69cbba89d47e81e73189bd9ead/xatiludifumaj.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/85506420232.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/72706079794.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1b808e0ad---degopagonofesin.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/vesimi.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/parokexiza.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610df209eb022---bilemanipazusuzopigufi.pdfIn PDF document text
    • https://ratosatu.com/contents/files/guguvokusinafolijokigepew.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/93066027463.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/gezinolufevewamesude.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f38135de73---rutafudomanujinafex.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06276012ce---24186371107.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/sotewuludijijotilal.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/138f308eb59f2dc875c6e8d58f356e6d/wezevamizagaxidosi.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/furas.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF19 10612 bytes
SHA-256: 68494212eaa3c4f19a1fc92263f85f9c9372d300355ed2b026ede7e63347fd37

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