Malicious PDF — malware analysis report

Static analysis result for SHA-256 de429d7ac735e61e…

MALICIOUS

PDF

86.9 KB Created: 2021-06-27 14:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 289835f68f1380af9059acb087faa9c0 SHA-1: 4130925150f013a8c604cc3bf14bf7d8baffa05a SHA-256: de429d7ac735e61e1722c3371167a6fb828533bcd316aafa5b39a5a03fef4869
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF link farm heuristics and the high ML score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://stolizstekla.ru/userfiles/file/kefibadutixomixagosopis.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/88428765e0a4ccb178c059c2f04bcedb/perezo.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a90588d4ffb47d0bd4c0199c960b9318/2603130805.pdf
    • http://briarcliff70.com/clients/874901/File/zugafuwagokoduwefeweti.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/genejobijirozevaka.pdf
    • http://www.chubsorn.com/file/files/55690638740.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b650b832782---9114653974.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/llj7pe163tfdotufhjhdn6c3d7/55351653814.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160bca058aa641---fafovuwejifizozufenurave.pdf
    • http://seamcc.com/UserFiles/files/jonejumedo.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d12c87e1a4---12457430427.pdf
    • https://novahealthclinic.ca/userfiles/file/24065175772.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607177a0324bf---79268554221.pdf
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/184eceb46e53e9d84cf9a25594c86ff7/sizerepepuliga.pdf
    • https://fonixkoncert.hu/upload/file/9054991479.pdf
    • http://digitalpolicycouncil.com/imagenes/file/bilimigigeb.pdf
    • http://cbwmd.com/uploads/Files/38396964148.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751e67d1bd5---mokekisusepirevizunorize.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a06281644fe---40564572719.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/9ggiajbcl30dfgioj54bn5aagr/95431593427.pdf
    • http://opakowania-loga.pl/zdjecia/fotki/file/20635735332.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607762d4a6c98---97038418095.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cd9f38b7fc4bec2c445d25140c975b7f/dogef.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c2572b045d0---poropanomozilatotal.pdf
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/lajutajaj.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=dart+parse+string+to+int
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f069.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF069 16792 bytes
font_01_sfnt_off0001087b.bin
e4805145987e5bbc75a3c46a99d1f2516e30d84669adb72fdfb9d9b6447598dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1087B 17352 bytes
font_02_sfnt_off000136a2.bin
79e63e368dd736b213473e83462f2d0aac3b51065d12b78572b10edb1271a17e
pdf-font-stream PDF embedded font (sfnt) at offset 0x136A2 10380 bytes