Malicious PDF — malware analysis report

Static analysis result for SHA-256 05953efda72047cb…

MALICIOUS

PDF

74.1 KB Created: 2021-09-05 16:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e6c0a9419589d372dd03894a9beb824f SHA-1: 281d1cdc471d2b68b4c92bb6c651a3cecb05cb4d SHA-256: 05953efda72047cbda040ad3c97c7687f462620327cf2eec65f257f43c8cab4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary goal appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • 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.
  • 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://www.darvidproperty.com/news/file/fawetefumuwo.pdf In PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/7289841746.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/41786288495.pdfIn PDF document text
    • https://dptech.vn/uploads/files/10803486979.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/92097521812.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/38124685836.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/54699393418.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874223b217e---25898872554.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b6546dc3ddf---gotijasogutusorud.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/62445f24696f43193ad6d7237f77a462/raxapetibesegatokobu.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16123dc3db809d---37852598768.pdfIn PDF document text
    • http://royalgroup.at/tmp/bexaruxezege.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/3a8bk12svfbklo7le127s22fmh/zemepej.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/dfirv98rk0iulv6ks2g14sfj2l/87416079911.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/bewogusufovuxogedome.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/xufedovo.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/47904520166.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/gegezawakunebawakuwik.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/jabeveboxeluminijanuze.pdfIn PDF document text
    • https://blugarden.eu/file/29885744783.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/28096696939.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/5fpo1jrmra9n7l89cu9dvp91g0/visikabufeto.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/baditemimokowazetur.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/vowutan.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/65272120818.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/68330016015.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=philips+mg5730+user+manualPDF 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_off0000c00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC00F 15912 bytes
SHA-256: 9225d83c2fe50bdce382e375c0b8a67c6c2b60c0a07a997fbc97506e84bb0c4c
font_01_sfnt_off0000e929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE929 11060 bytes
SHA-256: 4473cbc8fa12b334eb8863d7ff81d725de6115eb60e142e15abebe8441d186e1
font_02_sfnt_off000102b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1