Malicious PDF — malware analysis report

Static analysis result for SHA-256 a98f08b64f780417…

MALICIOUS

PDF

66.5 KB Created: 2021-09-15 15:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 768bfd31fee315342a9de2e880026d1e SHA-1: 2904300390e639d5dd2ce3a5fa45bf7e287324ff SHA-256: a98f08b64f780417de734576f089eb3476ccd65ddf0426ed34f955642f439f8a
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, some of which are identified as compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9158

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=how+to+delete+software+update+on+android PDF link annotation
    • http://intemhathanh.com/img_duhoc/files/16023962362.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/jofamosoxamopobinod.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/towiv.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/tuwaxifuzu.pdfIn PDF document text
    • http://wonikquartz.com/upload/editor/file/1630999323.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/54277496575.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/81993904843.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/47617805678.pdfIn PDF document text
    • http://beijingteye.com/upload/files/94291545465.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138a90365efc---4036953310.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/87718861589.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/34718549158.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/3980578455.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/53251177652.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/53956259060.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/lakowunawuzaxaxera.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/9a0e090fb22f4f40b2c11308ec6c7b0c/dotozetixulivadiw.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/f958109d892dd457b647c7b4a8b682b5/4948342236.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/zamepuluwafumigimira.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/rorinolipe.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/zuforariwo.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/737fe04fb56f60fedcbabfd9b8b1cc32/8659851701.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/29851944486.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD173 10668 bytes
SHA-256: a5c47d51ce19f275457dcfac261a771eecf4d458aaf7a54ee51a4ffec2d787da

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