Malicious PDF — malware analysis report

Static analysis result for SHA-256 43959aa06f6006d3…

MALICIOUS

PDF

84.3 KB Created: 2021-09-12 04:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c65e61f703803dd3b0fb8deacc1c7b42 SHA-1: 672bae89aca2548da2573901302602f44d0ab784 SHA-256: 43959aa06f6006d3e0c490c26730e21f57e78bb2f7f618475781db585f157b45
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains or compromised CMS upload storage, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://infrive.ru/uplcv?utm_term=minion+rush+mod+money PDF link annotation
    • http://stavclearing.ru/upload/files/furifefazedofejuwugoz.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/nixusosurerisujemerasafow.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/84052215497.pdfIn PDF document text
    • http://hkwwta.org/userfiles/96244860710.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/66148292459.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///19526042079.pdfIn PDF document text
    • http://capri.lt/userfiles/files/63868366795.pdfIn PDF document text
    • http://erdbau-rauch.at/bunesijaxejadumozatakese.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/50823105362.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/46747794827.pdfIn PDF document text
    • http://pileki.com/imgup/file/zivugejenazopigeduvonive.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1d4a315fc---fufagizixebagefuli.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/vojotijaxafovedusonu.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b62c4721f4---dujejum.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/pavizawokirodivaxowulumix.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/xuzidogozus.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/xonetapolurotabo.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/dosigepibazifivutodasuv.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/ruduzedali.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/10355770196.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/getasopipitedunitodikamas.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/46086360563.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/bizuxusosajekiwovopule.pdfIn PDF document text
    • https://dcimx.com/files/fonudijenof.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5b8739924---19992477306.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f15325c152---41256082152.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_off0000e5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EB 10416 bytes
SHA-256: 8876ccd6cc9211d93babdbaf01c0408dc6c3d673f9f514b06c0b6b80b1f70126
font_01_sfnt_off0000fd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4A 17848 bytes
SHA-256: a02a4baac9c723c2dc176175599fbdc9eb67f24a17ba8be8ee3d427c2e4fc7af
font_02_sfnt_off00012b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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