Malicious PDF — malware analysis report

Static analysis result for SHA-256 451f02850fbaccbb…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 00:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4a51bc6c9bc22f969fdc8d40a4d2fac9 SHA-1: 5a2e426e8fc0ec67b972aaf97d31b005a292731a SHA-256: 451f02850fbaccbbabf8a98fd7b5076836278e766dda98bd57b8789c70865fec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads. The numerous external URIs, many pointing to compromised CMS uploads and disposable hosting, suggest a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://queure.ru/uplcv?utm_term=carranza+pdf+gratis PDF link annotation
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/rokelavefipexotetalikitu.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/uviej800iv2bnuf3hj7nmdp52k/zelogezikojatamexobo.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/e4d5b68fc62470a05aa0cd24ed22527f/lebowepavakoferizesif.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/16vds1jbr8fllrmd1veadhe476/xewuduweredulobasose.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/1511756352.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/bilirilafabakinuna.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/21426208832.pdfIn PDF document text
    • https://madopin.com/calisma2/files/uploads/lijikoposi.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42b7a28eb0---wominovegososaxuwuzamov.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/bibatitezupa.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/54513397248.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/bitopazumurupeja.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079968a18eef---pokolilimojubo.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/36617492304.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/ace3c1a278a1b5688b0c2f0cba40a2d0/22273967921.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/33068284479.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/84863054907.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0334987001627122849.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e29212fae---11925090970.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/powovojarepu.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/febolanup.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/61831204211.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_off0000dc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2A 17860 bytes
SHA-256: fcf4f91571c3d519e5c32d393d6f376ea0c15c2eb17aa70afe4de6c94d858f1f
font_01_sfnt_off00010a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001221a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221A 10468 bytes
SHA-256: 748e7866f2a2028fb8f8c06d123251c3d2f6a6e87cd077a0f3334a3f3f0f3f9c

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