Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c30432e8a472bf3…

MALICIOUS

PDF

79.0 KB Created: 2021-07-02 20:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cc6e6a9ae82913a636304bac6679982e SHA-1: 5e59bb3583fedfb46269f46fc5a20e4b536e4295 SHA-256: 5c30432e8a472bf3ee6533f193fa9998bece856ffc5fe1008936ea6dbe1ee9a6
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the link farm structure suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6957

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://infrive.ru/uplcv?utm_term=learning+japanese+ebook+free+download PDF link annotation
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf51d573c7---dakasonuvuzon.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/63527049715.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/tesovapolatonaj.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9590c6538---50512418948.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/uqd3jmk69qnv3fjl9fvtqfr9f1/ziredobe.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608211eac9fd0---20161665831.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/99700576649.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099f7fe8fedd---menesitefekorasenusom.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/52967540087.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/1916635265.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/94097080797.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/d200a6a47d8cca413aee63137f00d73b/nekibelezabulibokegike.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c8edfb74e91---38262143783.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/e2d4f6e2da5f1b205e1bccb5c8ec096b/6182913454.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/af0156a221a11082da46dc2a1c3224d4/kujofabisoda.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/77080959084.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0edacb71b---fabizupaputovir.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/5513ffcf2f3d0dbbb3317cf2198e5fea/munologavisalajojok.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b0595b8e719---nomofitizavoduxugefexofe.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/mesipusexazefem.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/8c8dcfd9b0a0540f9041372dae90545a/68953425280.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/b2f6a48ae9e05d6cd96402840fcfc399/29699214606.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c48300b22b4---59716729219.pdfIn PDF document text
    • 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_off0001092b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092B 9436 bytes
SHA-256: 4cc3a2018b399b058531a6136874295856e75ec354ae270ea60ac9c90695d11e
font_01_sfnt_off00012821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12821 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1