Malicious PDF — malware analysis report

Static analysis result for SHA-256 57bcd7c1b207027b…

MALICIOUS

PDF

82.1 KB Created: 2021-09-04 23:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2f1767da15a30938e751f962e18b98b0 SHA-1: f22e2ff4f9823a1cb37408de18319aa9cfeb5b56 SHA-256: 57bcd7c1b207027b6c22415bbe583aca41327a3c6020726779e5ff6ca9b64780
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload storage and other disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://yummyschool.com/_UploadFile/Images/file/fugoje.pdf In PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/7cmfuomrm6ncpa1jm9r5m1be40/69742973385.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/92665746649.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b63aa90b2e6---6963924209.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/obi2rolpfcd8ob63hj54jv1bb8/dapabutobama.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/gofon.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/jadonubef.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/dudupipafusopapagar.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/53ae108fb402cb4b14917a1437ce64df/74067909313.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/wupuparujimonamega.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/poh91oqs7a3vefr1863363ee2s/falido.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160724de19b831---kefozisi.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079f25fe60eb---23548758468.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/562178500.pdfIn PDF document text
    • http://patokapugsnkisses.com/clients/61143/File/90985625955.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/2105102154423445279h6mz0.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bb36ff90361---duzebifepuf.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/22113168562.pdfIn PDF document text
    • https://glory-aqua.com/userfiles/file/kanizomuzu.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/15742864039.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/21125180508.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16088a50a6fb1a---91765039962.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=othello+act+1+scene+1+summary+pdfPDF 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_off0000da59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA59 18104 bytes
SHA-256: 26f93d926d9afe060d0832a7b611bbfa72bbaf985e7c64375bf6bdb149b6f1cb
font_01_sfnt_off0001095b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095B 11084 bytes
SHA-256: 2247a05b655386ea725c378e66c5d0edde6cc41eb9bc459aa104d4472af85039
font_02_sfnt_off00012329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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