Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c859c0cd6c20e3…

MALICIOUS

PDF

62.5 KB Created: 2021-09-25 02:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6c2fdb295aa72f9be6d90b0738179ea8 SHA-1: 37cc0b41c1cd197c5fdc254e3048629aea738d23 SHA-256: 16c859c0cd6c20e392928e8cc346e8aa5b8a1fd9c8982416dca7dd7ecb104471
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. These links form a link farm, likely intended to redirect users to phishing pages or download further malware. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5920

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://pistant.ru/uplcv?utm_term=mobile+legends+bang+bang+mod+apk+unlimited+money+and+diamond PDF link annotation
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/temifitesipozalegapolate.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/90211702379.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/dipawu.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/fomiwituvufadutijokema.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/japovokokebos.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/dolulebomunorexilip.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/depukupetusezusozuvepak.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f78e556aaf---72557901873.pdfIn PDF document text
    • http://fohow77.ru/upload/file/44201264303.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/92729889422.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/48190622050.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/70426662698.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/69663330408.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/baf9efe1f8153eccf6ba38c50521d9eb/91577842524.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/jiluvokodukegapegoren.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/bufisiw.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/kozevosebuzoduni.pdfIn PDF document text
    • http://ucokampen.com/media/files/44779029654.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/8f0cf2f9bc9967c3528b30a5a8cbfd79/fujakozopiviku.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c35ef1003---31150183303.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/9156785977.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/lemifogusorot.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_off0000af71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF71 15360 bytes
SHA-256: 83a5426f6a5197c035d040d7f2fd416605bb7be2e6221b09eaf8ff76d5774cd9
font_01_sfnt_off0000d676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD676 11072 bytes
SHA-256: 1c59226b3121324046ae46f1a46b3657ac1d67493d67e3025390491161f1f60f

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