Malicious PDF — malware analysis report

Static analysis result for SHA-256 d67821c60fc2fcd3…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 05:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 384dbb7678a7dbb2f6a82f8b5515ac02 SHA-1: f0d0ff022cab4176b149bf7301dc4705442d64e1 SHA-256: d67821c60fc2fcd39179b2db3160b062e4a136f38d32e4d6e26d0173d72cad0b
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic firings indicate that the PDF acts as a link farm, directing users to compromised WordPress sites and disposable hosting, likely to download further malicious content or phish for credentials. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://etoprosto.ru/ckfinder/userfiles/files/28186923378.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/9aebed3103793e21aeff2c810518749a/lomewonogijadepakad.pdf
    • http://novussiteyonetimi.com/uploads/file/xuzizu.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/2dac8d46b0bb713ffcdad697e57c3640/89965236587.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cea2702b3f---45999169549.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076316c9b8d3---58271736978.pdf
    • https://equator-maritime.com/userfiles/file/48631664836.pdf
    • http://siripanyalamphun.com/user_img/files/50649417449.pdf
    • http://sitepride.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/601390365.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94add4385---tebilavuxidirovekos.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d524b240f4---xulenifalekobigujimasuso.pdf
    • http://igigeothermal.jp/userfiles/file/95611733047.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/426ccc4bb2555022c9b691984207fe53/67217305137.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/gomci2ss5v740ajubud48ugml6/sakalarujoxuzuvovozogon.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/099c5abbed6c54adb24f37ee5fedce9b/bexorobopojidunoxaxab.pdf
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/zewotok.pdf
    • https://jahanchart.ir/data/files/file/ximexinisal.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a79cbe9dddd---xogevufiwin.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/0b9a02f5f0a76ce9ed954b96f83072c8/gavimuxegawitekuleralu.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/8a20b5e7fff386e3cedc0416644d9128/91262091028.pdf
    • https://corghialberti.it/file/43602989215.pdf
    • http://helderlive.nl/ckfinder/userfiles/files/88214525026.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=gotcha+evolve+pokemon+go+manual
    • 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_off0000d834.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD834 16792 bytes
font_01_sfnt_off0000f04b.bin
fbddf37ee49c92904b894c191eb241c9da747a363d3309fe35167fe58eab1c15
pdf-font-stream PDF embedded font (sfnt) at offset 0xF04B 10756 bytes
font_02_sfnt_off000108f2.bin
57edc951c6db1720dbc57f5be76d0be649dea4f32c7bd658a8b23ee09f55daa0
pdf-font-stream PDF embedded font (sfnt) at offset 0x108F2 17976 bytes