Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f06fb06f045354f…

MALICIOUS

PDF

61.2 KB Created: 2021-06-19 10:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: b2261610537c8d33558d63626d1a7723 SHA-1: 543d275fabe8ad73c6a51bef0a80fda1744ec362 SHA-256: 8f06fb06f045354faf5fc15bd4492818bb66c0a394083f51bd6bcb9b05010b24
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging further supports its malicious nature. The document body, though heavily obfuscated, contains references to 'Sonic 4 ep 1 free download', indicating a lure for users seeking pirated software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8940

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://digireg.it/upload/jejituluv.pdf In PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/rqqeudf637oa3jq3p9rlvfe4p4/65658520778.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/9bdbeaae0bd2eeff6fbf9a05520192e5/mafobixaseni.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607538a08f164---sefikonekomez.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/8d04edc493b1382512f7496bed54485b/67701537818.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/9b39dd95c6165aaa190a0f3fdc4b255a/xapozepilipujupej.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8de7daa22---bokofebirunisonetugu.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/debotofigitafinukagite.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/bimewutikojulemin.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e0f772987---futebudapix.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/7a126321bbcf90e25267203b42c95974/7483262057.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/94181249949.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5b6ba1968---zoxisilemowuvonukigejag.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086c879ecb79---34405010541.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/c847ac49cdeb5a2f33a40c0680dc0de1/77783350434.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bb39eba4c81---78015117690.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/76240800059.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=sonic+4+ep+1+free+downloadPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AC 5308 bytes
SHA-256: 0d7b495310a2507d569b335debdfb634049ffebf2a724953ad90687905eb7eee

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