Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d56d55638bdb232…

MALICIOUS

PDF

79.2 KB Created: 2021-09-06 09:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e140477dffa27a40b6dc8ad88a68502b SHA-1: df36657a16efa733483a13274f667a9545c60db7 SHA-256: 6d56d55638bdb23296daeb0804ac7386c743f55a62494a190b3d31a8fda83a28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic findings point towards the document being used to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160828f6cd1e04---7918089236.pdf In PDF document text
    • http://faurerom.com/userfiles/file/43660970674.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/bowakebufubu.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/3187358064.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c374ddd6661---jamebugisof.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/fozisirugemape.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/1219123275.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4fecdf055---jidekos.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8e5e30321---14240019297.pdfIn PDF document text
    • http://ruihuitax.com/files/file/mubom.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/lesatuz.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/xujudizosozipije.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/a20d8f6c19122986bccca4a1a44f5f02/77333537185.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/4369f1e1ddde2ca5dd08bb86641a089e/17226799135.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8fd1a9e3a---ruzubesuwatepiwixar.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606da2b7f3288---31440995209.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/d39937089828dfa9666970db15a25e97/32705703391.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/65015149738.pdfIn PDF document text
    • https://luminex.pl/upload/file/965118166.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/74744898684.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/eqsgqdm2di9kp68lecc0mhsh1s/48309504789.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/46813329365.pdfIn PDF document text
    • http://kidneytexas.org/clients/861060/File/xukawuteviw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=patofisiologi+tumor+tulang+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_off0000d18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18E 10808 bytes
SHA-256: 897a4329356715433ee01129111edf44463b261ea0e568bdc7f4315df8357d9d
font_01_sfnt_off0000ea37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA37 17636 bytes
SHA-256: 13d138e39959e8936be5fd8617a07815c6f2d04e5e1fc9407be929098e1df682
font_02_sfnt_off00011740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11740 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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