Malicious PDF — malware analysis report

Static analysis result for SHA-256 0537951394890d2d…

MALICIOUS

PDF

75.8 KB Created: 2021-07-16 20:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 43fc1e46a4265f55b42e4a6396913daa SHA-1: cac1d52b2b85d3389c6634a8a4668b84cc6787c7 SHA-256: 0537951394890d2d7ad0ae713880b484ca765a50ebd7e3dca8953ed0479d8f9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of multiple unknown URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://badoza.net/userfiles/file/bowerixenosufovirevoto.pdf In PDF document text
    • http://rotarylaspalmas.orgdocumentos/file/2810173525.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/5ie34qqpssovjc4l2s3fu4q911/butumazezovafizexorozif.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/b617779f5ae563ecf07a7c3912d53b2d/55676928352.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d5ae51938d8---mesir.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/89754975577.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/8e1e1de6236ffa5b5f7a519f98ef9643/jadir.pdfIn PDF document text
    • https://agatanorek.com/files/file/razulesoxoxex.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160db25cb7ea39---36620017455.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/70958481609.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a04fe9626b3---60939172652.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/d560533a122f2d562d4a6351beef24c4/75114725365.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/d59380790c1ccaef803680450ab0435f/25269461815.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/81377411905.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/ucagjiukb688f9k08l64njdh13/vatavekaworeduvukixino.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/93603116359.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160761c6a60f13---19135909305.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/5f8pmmjb7d3iimnrfu54c6ti10/46143503746.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/92155531921.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd85297ab7d---42273924474.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/88ee1778060cd5095cb9800f05b58c7e/dutije.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/tozolutuxonola.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/0b18ddd4dc6650d062a655ca42baf28e/88956430915.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/xejiperemujidawavoxojono.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/vesipegijiw.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/o6i1e1m7mj40rtrg1907211gm3/zazukarada.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/ab23c4f9a2077aea2aef721a6c864aee/43709303859.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=department+of+unclaimed+fundsPDF 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_off0000c35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC35A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6C 16848 bytes
SHA-256: ce0b3c6bf9f11be21e07fdf12729b34fd4e83fdd28a53147aefd5d3dfae3e58f
font_02_sfnt_off0001072b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072B 10884 bytes
SHA-256: 34f72cb7f09ae490ab45cac4a1dddb1a10c204448b4c2d427dc343c6e603c3de

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