Malicious PDF — malware analysis report

Static analysis result for SHA-256 15186372618c7949…

MALICIOUS

PDF

88.6 KB Created: 2021-07-17 10:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 212bd657bbe5198601d6c150010f7dd9 SHA-1: 57c5ffc6ea3f9dfbec4455d27cac5fb9919a0ec1 SHA-256: 15186372618c79491ca6a1152a17da3d3efe40c39ba614741d193e74be867d26
156 Risk Score

Malware Insights

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

The PDF was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs, such as http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/5f6a056e85db8b3c06d83badf0df150f/tazam.pdf, are likely intended to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://thecoferfamily.com/clients/7/78/7892d776c92a08c80f86ebc6236678d2/File/27624944240.pdf In PDF document text
    • http://keyflounge.nl/userfiles/file/pajozejivowego.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/58865434577.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/14192523166.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/45827734913.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/jiguxukisobub.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/5f6a056e85db8b3c06d83badf0df150f/tazam.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/36042038677.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/6614221848fe8992a7454083b91cd3aa/mebop.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5d2d69397---devipoxet.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/3a58fdf1b00f44dbe61f9d315f4e861f/87035443939.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/20291509646.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c712eadb8---29554221304.pdfIn PDF document text
    • http://scro.ru/pic/file/13605240438.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/p191toa2hra0h5nf7j4hth3uqk/tinelusakeluzu.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/55608469353.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/24849305870.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bba24540365---33942727292.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/ff8bbffc2816462f308b0df9f9e73b04/58224996823.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0afb63aa3---46367562376.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/fupavupaditebukidefakaz.pdfIn PDF document text
    • http://dzbnf.com/upload/file///77093552258.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/zunevikifitupodikobezux.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16090173651fff---30603315770.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/c1cb631d09c44e9cfef986d85a3c8ef2/9879364907.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ever+after+high+streamingPDF 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_off0000f7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F1 17316 bytes
SHA-256: 0f95b450e9b03f929f46da606b6a26c5194317549abfb4219d1cbd9bc9490b1d
font_01_sfnt_off0001254b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254B 10544 bytes
SHA-256: 28c50e0565a400ebc08f6a121424a7cab7f9a575e416cdf283d3603de07974fe
font_02_sfnt_off00013d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1