Malicious PDF — malware analysis report

Static analysis result for SHA-256 e512fa904b81153b…

MALICIOUS

PDF

74.8 KB Created: 2021-09-01 17:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 1844ed9461a147f59cceb72ea9ffa7f9 SHA-1: 8c8d85a21df0c041aa94a71fe7e10b56852f8001 SHA-256: e512fa904b81153bd07c85bf23755c3937f10845a033cf34236a1fd37b5b3eec
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to exploit user interaction to navigate to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8530

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 http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a9461fddb2d---26502267183.pdf In PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/74568770289.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/86494340205.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/24104087815.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/388789923610f99fa9e6ae.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/70508128455.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe2f03a891---61106637876.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/64901098758.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/53398be56bca3657cfd1f127be5c8af5/votekixuxubenalit.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/85805055234.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/f585ae22a3d637d34e183aaf626e11e2/66588456435.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/kanutateranunizadiba.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kojoruguzejumujudi.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09ffd3596b---61541225386.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/10019510155.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/c14783aa2d6620e0e1d679f443c5ba38/zitikubon.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/sutipuzewen.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/2a99bba9995b3868d73ec91b47c35726/pazamubowuxuxatiwugufoke.pdfIn PDF document text
    • https://reniuved.it/file/datalive.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca5a543f25---betuku.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/t6frcgdhpja33ft2ogjkorsf1t/55857546008.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c9689527f5---padisopamekuvup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=heart+touching+naat+mp3+downloadPDF 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_off0000e588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE588 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9F 11144 bytes
SHA-256: d8cd463dd584e323ae675c0f3b8ac0aad8754a2e1f8399f9067fa0ce0415ea09

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