Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7ee1dccc77a6391…

MALICIOUS

PDF

79.4 KB Created: 2021-09-18 02:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cad356b545ec10c2581b99b07598adf7 SHA-1: c5010fdb4b2bd691a170737545b144fafb9f11ce SHA-256: e7ee1dccc77a6391b248a564c29cc6bdf5675b980b05b3f26860169d7422be0c
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 multiple disposable domains, suggesting an attempt to distribute malware or conduct phishing. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a lure to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://co-wemart.com/careeruserfiles/file/58756547309.pdf In PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/4b3ca36cc2bf0a8c47a09f8b291e9286/57568204839.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/60369725984.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/fonugesidexisefezomek.pdfIn PDF document text
    • https://unosms.us/userfiles/file/pakunupip.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/83360725507.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/91121692579.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/22790068122.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/q12cq7nsgsovuh3do9vpqmkkc3/sezinemijiwidif.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/fefaxumivekapodi.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/72929577791.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/60484505479.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/12392064740.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/1259872969.pdfIn PDF document text
    • https://argumentua.com/i/file/88399755553.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ad8b73b14---66254866819.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/petotugelegakoxijosiso.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/demupado.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/8484207414.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/13562480395.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/gopukot.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140976d3c30c---95360964341.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/53201345570.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=pros+and+cons+of+rooting+android+phonesPDF link annotation
    • 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_off0000d229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD229 10852 bytes
SHA-256: 85b14dd938eea2c6240a14d5f9d983a6adfa8f0499973f9c8bb76186b46e132a
font_01_sfnt_off0000eaf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF8 17356 bytes
SHA-256: 3de95cceb7c7ed6b157bba4c27d3879ea545743dd8b337c995d378998afc39b6
font_02_sfnt_off000117e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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