Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb1ef1f84b5a20d2…

MALICIOUS

PDF

71.9 KB Created: 2021-09-17 18:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a332a7ef327c48d5c0eba99a6b2bc08b SHA-1: 03b2b63bfaf81731428caf5cc5c5efbdbcd89e53 SHA-256: fb1ef1f84b5a20d20467e1466249593691a5bab58953b7bed976b1f415975d84
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs that form a link farm, with several pointing to compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://philabc.ru/uplcv?utm_term=hot+bangla+choti+list PDF link annotation
    • http://greenlivinggarden.com/htdocs/UserFiles/file/jomelulajijolijorakakis.pdfIn PDF document text
    • http://chongros.com/userData/board/file/zuzapukosujomizajozo.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/214b1058ff9d7d2d39ce37643f3231f2/vetufusaleliladosimubuse.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/xekeratagazezak.pdfIn PDF document text
    • https://anaksemut.com/contents/files/fibusajaxotitifuvo.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bdd0728c1---77847140358.pdfIn PDF document text
    • http://llux.vn/uploads/files/nutabowisekedirapudiseti.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/tubapowenebaziremot.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/42116264372.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/vavosazo.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/0432d958490f8e31af32ed4bcbb0efac/bipikejexoxugofepafipelat.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/47201800253.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/zinikerakabajax.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/dudujovufawov.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614307f77fc31---61873991215.pdfIn PDF document text
    • http://anpo.vn/upload/files/tulubalisad.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/85099529784.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210904074900.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/kowuveredadibesi.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/taminijamesegutagibozino.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/73228464998.pdfIn PDF document text
    • https://phm.vn/upload/files/93544721729.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/2109131407593194078kvtez.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/78899262750.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB357 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB69 17420 bytes
SHA-256: e814c1320805c18b1a5d9e5a29cdef56af111e2f35e6b789c9f2627ac3d3934c
font_02_sfnt_off0000f96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96C 10408 bytes
SHA-256: 630b2ea1358b6600c4bf07ccd05ae4f6606e6b72e53bdbe34ac1af8c68e0d917