Malicious PDF — malware analysis report

Static analysis result for SHA-256 55dd69e9a0b0bc8a…

MALICIOUS

PDF

81.2 KB Created: 2021-09-21 17:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e233b7d641cc939627ba36f471e7adfe SHA-1: 5c86527e86264bc5c7569d9e6dbe6fce8d85c0e5 SHA-256: 55dd69e9a0b0bc8ab3c75f481845f27040c4eff8fc98852bf1dc3cca5ae40017
96 Risk Score

Malware Insights

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

The PDF was flagged by an ML classifier as malicious and contains numerous embedded URLs, many pointing to disposable hosting or compromised CMS uploads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on disposable hosting, suggesting an attempt to manipulate search engine results or distribute malicious content. The presence of multiple links to PDF files on various domains reinforces the attack pattern of directing users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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 https://dalton-english.com/userfiles/file/64521668806.pdf In PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/volepe.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210905045001.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/57376834684.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/39670566371.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a02da88fae---nefojadeku.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/24626063001.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/88336662277.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/22601639554.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/80739961387.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16149b040e78d2---lenejawupajixokonove.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/60840904619.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/60243415735.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/nozoxeginazomojowe.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/vekasemadatazigezove.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bowitijaxitexaroxaxa.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/rutunuturuxovebonefitula.pdfIn PDF document text
    • https://eklyps.net/images/file/kikalovedove.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16136f6ccbcb39---rabatukeninuwewanati.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/zapenawejamoxu.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/55602070115.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/161421fe964fea---nalup.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/66033569929.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/31bkvmiuu74s54p4nsllbmnha6/girinozonetisipuvudufituv.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c508866f8---tifebezired.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=open+app+on+my+phonePDF 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_off0000d9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EA 10152 bytes
SHA-256: ef7ad64d2016a6ca2876c8c6cf1bf82d3115850217b5321f85b63499ecf1a860
font_01_sfnt_off0000f068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF068 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001087a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087A 18228 bytes
SHA-256: 6498e05d14004c73ca765614ab5ca1a8b88ea18bcec793cb898d5ba13254035b

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