Malicious PDF — malware analysis report

Static analysis result for SHA-256 73e015cb22a75235…

MALICIOUS

PDF

82.1 KB Created: 2021-09-21 04:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4d135b057f765f6e6a0e48fef401917c SHA-1: fcd9de75c08faf0553050e3d1e493493a392ed62 SHA-256: 73e015cb22a7523547b5ae3d6e2e456a5a23cb25aea5cfbb32a1a95cdc509b46
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are identified as part of a link farm hosted on disposable or compromised domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=a+quiet+place+ii+release PDF link annotation
    • http://thibidi.vinadesign.info/uploads/images/files/10083871750.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/fewepakaledado.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/zogulegokomatidejaka.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/73914082350.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/bepepalekigejezupovis.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/gikotokazejevo.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614595173704c---44039549832.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/20070564150.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210914000657543655z4efkg.pdfIn PDF document text
    • http://mhzsolutionz.com/userfiles/file/murolamikumejoxavu.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/20646315432.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/xukajujarakababa.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210905030051.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412350db414---pedumodit.pdfIn PDF document text
    • http://storemisr.com/uploads/files/fivibujekimoso.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/mogamew.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/a01edff02ca7993536a1caadef4be192/67507782752.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/1351501080.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/vamegotojoge.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/giragubegezinazi.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/48593647483.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/19291801005.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161358b01bd801---pejuvemafomitozavefi.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/9834374708.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_off0000deb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB7 17100 bytes
SHA-256: 3571f195c0e23b2628ebbd8101068762fac80128aca9fa91b620fbc100681ceb
font_01_sfnt_off00010b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12330 10372 bytes
SHA-256: 8b20893433ad3641447b9e612f2ac77e7b6e10074df15cb2a64fb1487cfb3f23

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