Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa8646cafa5ac16…

MALICIOUS

PDF

85.6 KB Created: 2021-07-30 04:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d0abf10713f5f11fa9900387d950b31b SHA-1: f33ec4b0d3a0044184e2cfc1231dad95a1ffb608 SHA-256: efa8646cafa5ac160d6c50b41017dc4233f4b381081199e7bd6bef69ecdb7508
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/2d9b3c40775436ae334fe68ac9705089/8423310619.pdf In PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b073cca5562---zijujulodedod.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/42445342804.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/patuxegabutusapogaraxo.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710376d7261---5508867860.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/83318540599.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/hkovg0gkvpejs7i8vifpe9l2b0/fifutijiliwodekowipuj.pdfIn PDF document text
    • https://bamor.org/userfiles/file/28488055091.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/58698457c2d661ff80daebbffa7cc021/54030181574.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/d9733ac283bd67f415fa63cffcefb982/45602804964.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/49747111938.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/caef9e938c03ac432dbef03b88987705/kuzufawomamoli.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/09879b062d590e21d1253899cb324af5/xolidisa.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b742c5ee4d---98664325381.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/932fc1d554c04740a1ccb3b9c2700a46/75006577926.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/81102387734.pdfIn PDF document text
    • https://atesolve.com/ckfinder/userfiles/files/nitibatoxanizidinol.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/30409711558.pdfIn PDF document text
    • http://aweibel.com/Photo/file/98252380239.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/91776444985.pdfIn PDF document text
    • http://szwygs.com/upload/47131495127.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/14432279886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=thinking+in+c%2B%2B+codePDF 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_off0000edc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC6 17236 bytes
SHA-256: c60033a27dcfa847093212c4decd26909f03f21058a74258cb048ac73056045d
font_01_sfnt_off00011ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACE 10132 bytes
SHA-256: 5b5003bc2ac7fc7fc79f5b980e6f14879a72fee122e835ccbc5bbb798ff971f9
font_02_sfnt_off00013121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13121 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.