Malicious PDF — malware analysis report

Static analysis result for SHA-256 d25fc0319d46d54c…

MALICIOUS

PDF

88.6 KB Created: 2021-08-01 11:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d7cdcc4e679871369402c93c566e99e SHA-1: 46434aa696adb0ddf7b90a6a07d3343083dba7e4 SHA-256: d25fc0319d46d54c8025bb8b545734bac4d9dde17c34dbf3bf8d93da79face49
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://irepairplus.nl/app/webroot/files/userfiles/files/68181108765.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/d25fc913bd34e3436a93d6d9752a2df7/14246153182.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/b4f9259c11c434ebbdb3460cbd377651/47920818951.pdf
    • http://lubrifianti-auto.ro/files/file/gogivapisagifebu.pdf
    • https://mlbcsimleague.com/ckfinder/userfiles/files/kilemisomuwodi.pdf
    • https://quatcongnghieput.com/uploads/files/17967306945.pdf
    • http://2990592.ru/ckfinder/userfiles/files/18532443932.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/3acb460868a2781cf5745dd24a1c0f35/5176293864.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609efd8c62d20---2980415335.pdf
    • http://kowel.com/ckfinder/userfiles/files/1622951960.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8a5c9827f---94181899752.pdf
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210527184109.pdf
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2105080122525950819cogns.pdf
    • http://fitviewer.de/files/file/vomolubef.pdf
    • https://iva-vietnam.com/userfiles/file/45087666981.pdf
    • https://mszukam.pl/dat//file/24837301348.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b4e8030f2---puseli.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/t9q28dnnogghiqlr4he28me588/jewivugatajikawejex.pdf
    • http://apsara.ru/userfiles/file/nemuzabuninoromelokivil.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c07f5153bb---fuzawonuxovisovijimazuru.pdf
    • http://a-aqua.fr/ressource/site-image/files/damuzivawozuwozurux.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a60a9dfe58---nizopusexufuzibejupak.pdf
    • http://www.la-rocca.pl/app/webroot/files/files/51757432888.pdf
    • http://www.siscbolivia.com/admin/uploaded/fck/file/44725746020.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7025c1c5d---lulelevologobawita.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=little+fugue+in+g+minor+piano+sheet+music
    • 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_off0000f422.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF422 16792 bytes
font_01_sfnt_off00010c39.bin
56b055413c1206962dfbc4b1ff621531c03c60455c74eec607a860413a14a9bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C39 10984 bytes
font_02_sfnt_off00012583.bin
135b603fcbfbe3c3e1589e60826e228b5a4c6eb5896ac8ce2723f23f05482044
pdf-font-stream PDF embedded font (sfnt) at offset 0x12583 17576 bytes