Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa8d7d66190e853…

MALICIOUS

PDF

76.2 KB Created: 2021-07-15 19:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: d1caf3e112f6bc3a802619f5141a5798 SHA-1: 50b606347743a996a14725f701534dec5ccd6a19 SHA-256: bfa8d7d66190e85332335374b388303a86d433e04c18fd1bd697e4dc611d4a81
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the presence of multiple external URIs indicate an attempt to leverage these links for phishing or malware distribution, aligning with the characteristics of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://walkandsmile.com/userfiles/file/32355297786.pdf In PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/d06f0305221d3652b45b21bf4c1f2cc8/kejorekixaxibov.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160afc2c2ca118---fubigisodagok.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a30d04086b---zovevesevumobuvofulexa.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/dg45od4nfo1trdq3uqsj09abq3/8911255681.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/wigobofimimaveloxum.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-6-16/20210616221659187807.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b348519c4a---sagafesumekabawezebome.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/8ceb2d06faa77808b7c202dd8a2fd5d8/89435973618.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/44255361027.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608834a971c2c---vimobumoxoride.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/b9f5b81afb98c0034cc3a3657a5b42a6/70131600439.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/wimimedupa.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/pekoginew.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084f9e1ec670---setarive.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/ba8bd213db23552e7cf1a4a5db75ebe0/92702968575.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d44d0aaae39---vawukezexalozi.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/090213d050a9c691fb888cb63ef4b1b0/94533776018.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/ebf8e863671be07276ed04589b9a8e36/4502524585.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/vefibupiwujadeditokuradu.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/7830889406.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/47403501212.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/36226981619.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a2073d9e746---48934796313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=use+answer+as+a+verb+in+a+sentencePDF 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_off0000e4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF0 10356 bytes
SHA-256: a05cdbc96e6f57d7638ad95ce3945da6a9afd3fe2c88bc914a083492375d4e20