Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcae98b0e2724f60…

MALICIOUS

PDF

80.1 KB Created: 2021-09-17 16:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f0ccd1a83d3fe8974b550a3fffc9df85 SHA-1: 362dd0be767cb1b8a910bce77fc665132ad77699 SHA-256: fcae98b0e2724f60c5c401f0b18bbe46943af3cf978f43e5ca05e6e8d0fe997c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of embedded URLs and the PDF structure suggest it's designed to redirect users, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://medvor.ru/uplcv?utm_term=apk+editor+pro+install PDF link annotation
    • http://gpp300.fr/userfiles/file/22873658122.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612efe1a7d063---sekogodi.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/27035975065.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ghvvvqlqvijs4ovd2ivndb9f1j/kidobupazevobex.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141724a6b12f---47755429202.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/46515296968.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/wojuzivida.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/suzegadefaxodarep.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/69039858798.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/61162060255.pdfIn PDF document text
    • http://zuche0551.com/upload/file/77029812241.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/39259106696.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/16998565620.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/36135957219.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/titikininiwobamuvug.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/mikar.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/mizemipiga.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/72176881293.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210911035801.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/lgl0udk8saeutusc87mi37msl7/79849979992.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/10189360405.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/kojajitebogu.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/29220609549.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/ritazomofidolixibur.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/tuvub.pdfIn PDF document text
    • 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_off0000d2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C4 10456 bytes
SHA-256: c57e19184f9d0d272bd692804edd20ba0dfdd6c325e3417a474ed9538cc937a8
font_01_sfnt_off0000eaa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA0 18860 bytes
SHA-256: 8d92027cd597a79a478c0af432705faf4b5927c77b3a6822ec052d7906723849
font_02_sfnt_off00011ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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