Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a6a4c0a58107e8d…

MALICIOUS

PDF

74.8 KB Created: 2021-09-04 09:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ec3e7324af21af2bd6fdb7e31067fa6c SHA-1: f02f8e538a758a8389b2097682bb1b1235097942 SHA-256: 8a6a4c0a58107e8dc152e7f94ab52d57b756dcf61629f4442a2020d2e32b59ef
154 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many pointing to compromised CMS upload directories. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. The presence of multiple links on potentially compromised or disposable hosting suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8530

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 http://sartoriaventurini.com/userfiles/files/88969799253.pdf In PDF document text
    • https://secolink.sk/userfiles/file/kelato.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/28ae61d371fa01a4ae9ef1b02abe9b58/murukudejamipog.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f1b71cd40---34283697831.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd0163132e---71574353529.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b13a736787---pavizijuturun.pdfIn PDF document text
    • http://ymmicro.com/files/files/59882146893.pdfIn PDF document text
    • http://topstec.com/d/files/56344278649.pdfIn PDF document text
    • http://zuche0551.com/upload/file/97044414269.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/582a4cc79e9ae688d091fb5f37031e21/82007010482.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210621034250_1478130385.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/12131816271.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e8cc1c2b0---26510333014.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/16544237320.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/24aa967bde7e0d040d1a0fd6160e51e9/jofani.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/3332894922.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210715205033.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/gowefurokurefazaradexadu.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/bodamek.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/78174591778.pdfIn PDF document text
    • http://absigorta.com/E/file/dasosisinafa.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/xoxevowigin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=numbers+esl+worksheet+pdfPDF 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_off0000de54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE54 17616 bytes
SHA-256: f697ef9169f96981e722467ba6a69a6924ea39f61a79d2d4cb0e96f1d3b2f8ab
font_01_sfnt_off00010bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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