Malicious PDF — malware analysis report

Static analysis result for SHA-256 57fc1407ea09dd79…

MALICIOUS

PDF

73.2 KB Created: 2021-09-05 17:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eae1df69bcfd809db67149d9bff32a08 SHA-1: 7793c210d09b51a812582310664febfb99e1e998 SHA-256: 57fc1407ea09dd797ff4627c9a9bbc329e6d6d359322e88f0002472ef5776f3f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host and distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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
  • 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://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16073ae169ddc7---26350884382.pdf
    • http://amsasecretariat.fr/userfiles/file/fowogeb.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e9657304124---2232285984.pdf
    • http://alt-1c.ru/userfiles/file/83357431743.pdf
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/13716986724.pdf
    • http://exito-opakowania.pl/userfiles/file/42103048538.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a27f720d3---54561960431.pdf
    • http://zygzak.eu/foto_dane/wysiwyg/File/44448894211.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612c02b18a8e6---jiwevowepobezowudexujuz.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec4b2bf112---wofivuwenoveg.pdf
    • http://boxerdapolenta.com/cmsimple/images/file/63420697209.pdf
    • http://kaowei.tw/image/files/20210620_040457.pdf
    • http://quimis.org/js/ckfinder/userfiles/files/34003563717.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9243a29be---nixugaj.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bdc5204bf---tuxobakitik.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b4229285e---51081555423.pdf
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/guxojikimigokijumilesupa.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/b1e50b4155dbd532b0aaf6785cfd250d/11119139805.pdf
    • https://toskov-yordanov.com/userfiles/file/40824549236.pdf
    • https://salvatoredivilio.it/userfiles/file/3938776290.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c88258fc4---xopakipu.pdf
    • http://agataklimowska.pl/userfiles/file/41789007013.pdf
    • http://yousefmaktabi.com/ckfinder/userfiles/files/ravomot.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804a8c19f06---ketan.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=primary+source+analysis+worksheet+close+the+gate
    • 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_off0000bbc6.bin
3d9c1107c60ef49f530a35c892b548ddc97f571573c2ff605ff6df148cf93aca
pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC6 16112 bytes
font_01_sfnt_off0000e4ec.bin
5c9dd5b7dda8952274370e18308dd5205668e02264cc5bbb5f5c7412521107ce
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EC 11072 bytes
font_02_sfnt_off0000fea3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA3 16792 bytes