Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e9b96fb8bffc2c…

MALICIOUS

PDF

79.0 KB Created: 2021-06-14 01:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a7f48698c3a4b49aad6cda9e5bab1022 SHA-1: a45d65572abf0e050ced9e8049a511a45ca29e55 SHA-256: 72e9b96fb8bffc2c8d0860dd4c1e3246b01d3a7602d6ceae953e34c8c354efcb
154 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8982

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://synerhu.ru/uplcv?utm_term=singular+and+plural+nouns+multiple+choice+test+pdf PDF link annotation
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/8e3d49271ae195c8eee74e401fdb8c14/pojewupiga.pdfIn PDF document text
    • https://noddy.nu/images/file/88163703078.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/lemivefamowudufibafu.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073f7b8b9272---zezufofabugomesimededeb.pdfIn PDF document text
    • https://govox.co.uk/wp-content/plugins/super-forms/uploads/php/files/9u26lbooaf7ocoo8gal99hcd8t/48041314174.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7d8847527cd16cc32d980991af6cf847/11145036519.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/af7866rer1jq9kjdsmq4tjg3f3/83934701760.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaacc5b260---69178063873.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/69411147218.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/fe0c88106a1b113df2f1b294ad9d0c99/33428202454.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/79db6f62bdbcef30b7f93e7c6d0db97d/22567093324.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fbe08a239---zorabag.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/1gh7v45a6pasj26od1mbha7r55/1808782673.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/78065733792.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE432 5556 bytes
SHA-256: 67d45ff560c35279d403e6b5dea2012cc17492c271a1136b9760dad8c2959054
font_01_sfnt_off0000f6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E0 11040 bytes
SHA-256: 3e9d4ac5d300416a3932271444a5929ee726cde9bca3082719cedcc9a1428029
font_02_sfnt_off00011c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7A 16092 bytes
SHA-256: c9557d91917e40dbb2ce09b7ef560a04a9a832ffe2ebcac6b50408a58351272e
font_03_sfnt_off00013142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13142 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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